I have another explanation for this. Most people, even the decent ones, get an uncontrollable build-up of anger when they learn about the war, and they have a need to release this anger somehow. This need is like the need to pee: it won't go away by itself. These people rightfully realise that "peeing" at the true offenders - the putin's gang - isn't an option, so they turn to easy targets, I mean the average russians. Somewhere in the back of their head they realise that it's wrong, but their much stronger animal part of their brain strongly supports punishing members of the enemy tribe.