Errand of Mercy, both the Federation and the Klingon wanted the same piece of territory, and they were willing to fight over it.
Yes, and in "Errand of Mercy" the Federation's control of Organia required the consent of the actual organians. This, apparently, because Organia was strategically located for attacks on Federation colonies, which is what made it valuable in the first place.
No, the Federation and the Klingon Empire did NOT come to blows because they were both trying to conquer the same planets.
The same with the territorial war between the Federation and the Cardassians, millions died before the two combatants decided to divide it.
Yes, and by all accounts the Federation colonists got there first. The Cardassians arrived later and tried to force them out. The Federation decided that the colonies weren't actually worth fighting for and simply GAVE the Cardassians some of them.
No, the Federation and the Cardassian Union DID NOT come to blows because they were both trying to conquer the same planets.
By the numbers used during the Dominion War, Starfleet was bigger than the entire US Navy during the second world war.
And the U.S. Navy DURING the second world war was larger than it ever was before or since. The Starfleet of the mid 23rd century -- over 120 years before anyone had ever heard of the Dominion -- is smaller still, and probably so is the Federation.
And if Starfleet had been able to defeat the Cardassian forces in combat, you're saying that the Federation wouldn't have swallowed the entirety of the formerly contested territory?
No, I'm saying that in a cost-benefit analysis, it's clear that the resources they would have expended fighting the Cardassians would have been better spent doing
literally anything else.
So some Cardassian assholes show up on Epsilon Pachinko V and now they don't want to live peacefully with their neighbors... you know what? Screw you guys, we're gonna go setup on Epsilon Ramada III since there's nobody there. The cost of packing up and moving is less than a tenth of what it would cost to actually fight and win over this shitty little planet, so you can have it.
The reason the Maquis are even a thing is because they wound up on the wrong side of that cost-benefit analysis. The colonies they lost weren't worth much to the Federation, but they were worth a lot TO THEM and they were willing to fight for them even when Starfleet wasn't.
Ensigns of Command, a planet in another civilization territory was colonized, Picard obviously respected the (what?) abilities to excert force, so the colonie was removed.
Nope. The colony was told to evacuate as a way of saving their lives. If they hadn't evacuated, the Shelliak would have simply massacred them. And Starfleet would be in no position to declare war on the Shelliak over a handful of squatters on a planet nobody else wanted to colonize; simply put, given the opportunity to expand into territory someone else has legitimately claimed, the Federation will always -- repeat, ALWAYS -- bow out and move on. The only time Starfleet ever fights is if you back them into a corner and force them to defend themselves -- as the Klingons in Discovery unquestionably did -- and even then they're happy to kiss and make up when your forces agree not to shoot at them anymore.
if Starfleet and the Federation in general were the stronger, the colonist wouldn't of had to move.
No. Starfleet abides by its own laws and treaties, and more importantly, they respect the sovereignty and laws of their neighbors. If the Shelliak say the planet is theirs, then the planet is theirs. Simple as that.
On the other hand, the Federation also protects its own interests with a combination of technical superiority and diplomatic prowess. So if you show up one day and say "All your starbase are belong to us!" the very first thing they'll do is analyze your ability to actually make good on this threat and then calculate how much it would cost to repel your invasion vs how much it would cost to just give you the damn starbases and build new ones after you leave.
And this isn't really a hypothetical; there is probably a very strict and well-studied set of protocols in Starfleet governing under what ciircumstances a ship or the entire fleet should simply SURRENDER rather than go down fighting. We see this in the response to the Borg threat; Starfleet knew they were outmatched, but there was no scenario where letting the Borg into the Federation would be anything but massively destructive for everyone, so they came up with ways to defeat them instead. Picard probably had this in mind when Q was chasing him in "Encounter At Farpoint". When the thing that's threatening you is basically omnipotent, the most logical thing to do is cut your losses and hope for a deal.