To be sure, the Dominion were the aggressors. Obviously, they fired the first shot. Of course they were prepared to utterly annihilate the governments of the Alpha Quadrant. I'm not saying war wasn't inevitable. Even in my other thread, I never meant to imply that the Dominion wouldn't have to be fought.
What I'm saying is this: if one abandons the principles for which one is fighting, what is the point of fighting for them? War is hell (part of why it should be avoided at all costs and used only as a last resort).
I have also not forgotten about Section 31 and don't condone their actions or existence to begin with.
I thoroughly enjoyed the drama on DS9 and I know the writers intended to show a darker side of Trek, but from an in-universe perspective, I wish the characters had remembered more of their principles on the outset.
if you try to be morally pure when fighting a war for survival, you'll end up unable to defend your principles anyway when you're conquered, enslaved, or worse.