I think that at least some of it is a knee-jerk reaction to the narrative that is pushed. There is no analysis, no debate, at the moment NATO is sold like some kind of NGO, countries that until yesterday were bombing others with zero concerns today are standing in (justified) horrors for the Russian war crimes, like if we discovered war in 2022. For some, this narrative is simply unacceptable, even if it ends up in the right place (i.e., supporting Ukraine in defending itself from an imperialist nation). The problem comes with the NAFO-fellows and the likes, where immediately as soon as you say anything to bring up these very contradictions, you are a genocide denier/enabler/supporter.
I am sure that for others is a matter of countering the US, or the mainstream media or whatever, though.