I think it's a combination. There are accounts which run classic FSB style; series of innocuous posts and then ZELENSKY IS A NAZI, then innocuous posts.
Meanwhile, ignorant dumb kids who have been dealt a rough hand with covid, housing prices, ai, trump, climate change etc are pretty susceptible to the dumbest but most appealing simple answers/boogymen.
Add in the Internet's ability to help you avoid ever encountering an opinion with which you disagree and you've got a very toxic breeding ground for the worst and dumbest ideas.
All right, I'm sold, I'll cat sit for you.