^Pretty much this. The treaty was imperfect (and I don't think anyone felt otherwise, but that's how compromise works), and it definitely appeared that at least aspects of the Cardassian government weren't honoring it in good-faith, but it was still preferable to no treaty at all, and for the Federation colonists to respond in equally bad faith just further destabilized the entire situation. Diplomatic options may or may not have ultimately proven successful at resolving matters, but the Maquis rejected even making the attempt in favor of things like blowing up freighters (while they were perilously close to Federation-administered Bajoran space stations).
There's still the problem that the treaty would have cost the members of the (to-be) Maquis worlds much more than the rest of the Federation. They would have been forced to leave their home worlds they worked for years on (or live under Cardassian rule). I still would like to know if any Federation compensation program would have been in place to sweeten the deal for those affected - unfortunately we never learn of that AFAIK. (And I don't just mean 'here's a new world you can settle on' - it's still, say, 30 years of hard work down the drain and the loss of what they called 'home').
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