The Dominion War clearly changed the Federation as a whole more than I think it was ever previously explored...I mean if you look at it you had the Federation either explicitly or tacitly...
Supporting the genocide of an entire species (The Founders)..NOTE..this isn't the first time they had considered this as they also had previously attempted to exterminate the Borg in "I, Borg".
Deceiving the Romulans into the war by murdering their Ambassador and blaming it on the Dominion
Now the first one was Section 31..but it was a human behind it..and Sisko went along with Garak's plot, etc.
So yeah..the decay of the moral core of the Federation has been going on for a solid 20 years by this point.
Supporting the genocide of an entire species (The Founders)..NOTE..this isn't the first time they had considered this as they also had previously attempted to exterminate the Borg in "I, Borg".
Deceiving the Romulans into the war by murdering their Ambassador and blaming it on the Dominion
Now the first one was Section 31..but it was a human behind it..and Sisko went along with Garak's plot, etc.
So yeah..the decay of the moral core of the Federation has been going on for a solid 20 years by this point.