RSE - they only went to war with the Dominion because an Dominion offensive against Romulus was imminent - or so they thougt

.
So? The United States refused to actively side with the United Kingdom during the Falkland Islands War. Does that mean that the US had aggressive motives towards the UK?
The Romulans had only one possible reason to ally themselves with the reman slaves: Shinzon had a thalaron deathstar - a weapon which will be used to deal with the "Federation problem" (as the treacherous romulan admirals said at the begining of "Nemesis"). And according to Picard, there was only one action that weapon could perform efficiently: the sterilization of a planet. The romulans -and Tal'Aura - knew this; they were familiar with star trek strategy and tactics and they weren't idiots.
Apropos Nemesis - The romulan senate chamber from the movie had, at its center, a very interesting mosaic. It didn't show the RSE. It showed the border between the Feds and the Romulans. Can you imagine how humiliated, how frustrated the romulans are? That mosaic is saying: these humans unjustly denied our ancestral right to conquer the galaxy, they insulted us, they commited an unforgivable offense. We will have our revenge even if it takes thousands of years. This mosaic is here to remind us that, every single day, for the rest of eternity!
And abbout Federation aid after Shinzon - the RSE does't do "grateful". Not with humans, anyway.
1. I think you're engaging in a great deal of hyperbolic stereotyping. The Romulans are nothing if not full of factions with lots of different ideas about how they should relate to others.
2. There is no evidence that the Romulans "don't do grateful."
3.
Christopher outlined why you are wrong about the destruction of Earth having been the Imperial Fleet's intent all along. NEM makes it perfectly clear that Sinzon's backers in the Imperial Fleet did not know he intended to do that,
which is why they turned on him. Shinzon's Romulan backers wanted a military build-up and a more assertive foreign policy, but that's not the same thing as wanting a war.
Not really. Donatra was one of Shinzon's backers. It's more like, upon coming to power, and upon fighting alongside Federates, Donatra has realized that it's better to have the Federation on her side in peace.
Yeah, right, the Fatherland can do no wrong.

As
Christopher pointed out, the Federation did start at least one conflict inadvertently when it put a Federation colony on a world claimed by a foreign power without knowing it. And I know of more than a few people who would argue that the Federation was the one who started the Dominion War, not the Dominion.
You're also overlooking a third possibility, that another party -- the Cardassians, for instance -- may have manipulated the Federation and Tzenkethi into going to war, the same way the Dominion manipulated the Federation and Klingons into going to war.
1. You're forgetting that the Wormhole was actually Bajoran territory, not Federation. Blockading the Bajoran Wormhole would have been an act of war against the Republic of Bajor. Kira's "I'm filing a formal complaint, there now that that's out of the way I'll get back to work" line establishes that the UFP had to go to some lengths to make it appear that Bajor objected to the blockade (but secretly agreed to it) in order to keep Bajor out of the fighting.
2. There's a difference between appeasement and refusing to fire the first shot. No one in the Federation thought the Dominion was a potentially non-hostile rival.
Thank you for monumentally misreading what I said. And I'm impressed you know so much about the Tzenkethi -- especially since virtually nothing has actually been established about them.
What I was saying was that the fact that the Tzenkethi
presently like to issue anti-Federation propaganda is not evidence of violent intent against the UFP. The Bolivarian Republic of Venezuela often likes to issue anti-American propaganda today -- but no reasonable person suspects Hugo Chavez of having any serious intention of starting a war with the United States. Smaller states often like to use larger states as scapegoats in their propaganda as a way of manipulating their domestic audiences. A war would actually
not be in such states' best interests -- it removes their ability to play the "It's THEIR fault, not ours!" card, and it risks, as you note, a coup or occupation.
While it is certainly possible that the Tzenkethi are itching for a war, it's just as possible that they are not, and that they are perfectly happy keeping things peacefully rivalrous so that they have a boogeyman to point to to blame their problems on, but who won't actually act against them.
You'd be surprised how stupid people can be sometimes.
BTW, it's spelled "Alpha," not "Alfa."
Maybe. Except that that same faction reversed course and signed a treaty with the Federation, and has what the characters in
A Singular Destiny consider to be an essentially good relationship with the UFP.
Considering that more than a few
Federates in the
Destiny trilogy didn't seem to understand that until after the Borg armada emerged from the Azure Nebula, I think you're not accurately presuming the Tholian thought process. Ethnocentrism can go a long way. Just look at all the people in the US today who are convinced that America is militarilly invincible.
1. Tezrene is a female.
2. Yes, the Ruling Conclave undertook those actions as a way of getting back at the Federation for getting the Ferengi to hire the Breen mercenaries before the Tholians could. And while Bacco did that because she was convinced that the Tholians would hire the Breen mercenaries to attack the Federation when it was distracted by the Borg, keep in mind that Tezrene made it clear that, in the Tholians' view, the Federation did it to deliberately deprive the Tholian Assembly of more ships to defend against the Borg with. In other words, from the Tholian POV, the Federation acted belligerently against them and threatened
their national security. This is an other example of the UFP potentially doing the wrong thing without realizing it.
Maybe. Or maybe the faction of the Conclave that has power now hates the Federation but smaller factions within it do not. I think you're making some fairly broad assumptions about how uniform these species' thought processes are. I mean, George W. Bush was President for 8 years, but that doesn't mean that he had the support of a majority of Americans that whole time.
A fairly meaningless fact. Any rational state would likely have done the same thing, just out of self-defense.
Bajor had a nonaggression pact with the Dominion, but they're part of the Federation now.
Nor would I. I did specifically say that the Tholian Assembly is likely to be the Pact member most hostile to the UFP. But it's a mistake to discount the influence of factions within a society, and it's a mistake to paint these cultures with broad strokes.
Your conclusion - that the Typhon Pact will only be rivalrous
That is not my conclusion. I haven't come to any conclusion about whether or not it will or won't be rivalrous. What I have said is that there's no reason to automatically assume it will be hostile.
In other words, what I'm saying is, wait and see, and accumulate more data.
And the gorn are agressive by nature.
We don't know that. We don't know that at all. In both of their canonical appearances, they were acting in what they believed to be self-defense, and in their major non-canonical appearance in that Gorn comic from WildStorm, they reverse course on their decision to attack Cestus very quickly. The Gorn, quite frankly, seem a hell of a lot LESS aggressive than most of the states the Federation has encountered.