I think a material difference between Iraq (v2 anyway) and Ukraine is that they can keep doing the "well Russia was the aggressor" thing indefinitely even if the reality is more complicated.
also yes obviously some libs are still stubborn about Iraq, the worst ones, but for the most part its generally agreed that the Iraq War was a bad thing.
I don't know but I intend to blame every supporter of the war for killing 500k people both russian and ukrainian with bloodthirsty nationalism. I will not let it go. They will respond "Putin's war". I will continually repeat that they are nationalists that sent all of these people to their deaths over lines on a map. Some of them might realise their own nationalism, maybe.
The only way a dent gets made in any of this in the long term is by chipping away at american nationalism. Otherwise they'll just do the same thing for the next war which totally won't be just like all the others.
If significant blowback happens then you'll see people start to turn in large quantities.