At the risk of sounding hyperbolic, it's a minor example of satanic Inversion. (no need to be religious to understand this) When the outside force is in subversive mode, it attacks mainstream values as backwards and silly while preaching tolerance to appeal to everyone's sense of fairness and desire to be left alone. Once the outside force takes control, it no longer needs to pretend tolerance, and imposes its own twisted values both as a form of comeuppance and to demand submission to the new order. The NPC enforcer of the new order is the kid who hates his dad and aspires to be the exact opposite when he grows up. "Dad was so uptight and Christian. I'm gonna let my kid swear like a sailor. It's just words." But new Dad has to pretend to be an adult in charge now or nobody will take him seriously, so also "I'd better not catch my son using homophobic slurs."

Leftists in particular feel euphoric at being in charge and imposing nonsense rules against right-wingers - in this case trigger warnings and content ratings for what used to be no big deal, while pushing drag queen story hour and porn in school libraries. They don't necessarily believe in the new rules, but they're happy that the former "oppressors" are getting a taste of their own medicine.