TBH,given the membership of the TP,it really looks like a Treklit version of a league of super-villainy.I'm not expecting much in the wayof expanding on the reasons for each member races decision to enrol in the TP.The pact seems primarily to exist to present the Federation with another "big bad" sufficiently different from the Borg.
That really wasn't the intent behind their creation. It's right there in
A Singular Destiny -- Keith's idea was that the Pact would be like a new Federation, not an anti-Federation. A number of fractious, independent worlds deciding it was in their mutual best interest to form a cooperative union -- that's no different from the Federation at its beginnings (or at least the Coalition of Planets). Naturally there's a potential for competition/conflict with the UFP, and that has been the emphasis of the first couple of books in this series, but the intent behind the concept was for something more nuanced than a "league of super-villainy."
All I'm saying is that so far, it doesn't look like the Typhon Pact has any noble intentions. The TP was primarilly formed because each of its members had some sort of beef with the Federation; they are in essence disgruntled workers.
It was formed because they no longer wanted to be vulnerable to the whims of a far more powerful nation. That doesn't make them evil, any more than, say, European nations often dislike the way the United States strongarms them into following its lead. The Pact founders wanted to be able to stand as equals with the UFP so that they'd be powerful enough to protect their own interests, immune to the kind of strongarm tactics Bacco used to get them to join in the allied fleet against the Borg. However well-intentioned the UFP may try to be, it's still disproportionately powerful, and other societies may have legitimate disagreements with the way it wields that power. It's not unreasonable for them to want to balance it with power of their own. (And frankly it's quite ethnocentric to describe these other sovereign nations as "disgruntled workers," as if their rightful place were to be subordinate to Federation authority.)
Aside from that, the Gorn had no outstanding "beef" with the Federation; indeed, it was only about seven years earlier that Picard and Data had saved the rightful ruling clan of the Gorn Hegemony from extermination and restored it to power. If anything, the Gorn had every reason to see the Federation as an ally -- but even they could see its sheer size and power as potentially threatening if left unbalanced.
Similarly with the Romulans -- after the alliance against the Dominion, and after Picard helped defeat the usurper Shinzon, I'd say UFP-Romulan relations have been better in the past few years than at any time in history. True, the UFP is on fairly friendly terms with Donatra's Imperial Romulan State, and the Romulan Star Empire sees the IRS as an enemy, so they'd be unlikely to be too friendly with the UFP. Still, not everything is about the Federation.
Same for the Kinshaya. Their "beef" is not with the UFP, but with the Klingons -- and frankly they have good reason, given that the Klingons destroyed their homeworld. It's hardly clear-cut who the "bad guys" are there.
Well, to be fair -- Kirk didn't kill civilians or blow up the Romulan vessel. The Federation also only wanted that technology to study it and plan defenses, since the treaty with Romulus has the Federation opt-out of actually using cloaking devices.
