I think you are unfortunately correct, although I don't think it's accurate to frame this as an issue which only affects the left (though maybe that isn't what you meant). It's clear that humans simply aren't capable of learning to not go on witch hunts. Even with all of the time we spent teaching our children about Salem, Joseph McCarthy, and the like, it goes out of people's heads the instant they encounter a cause they think is righteous and important enough. At this point it seems clear that witch hunts are hardwired into too many human brains to be able to educate people out of it. We will need to figure out how to structure society in such a way that the tendency does as little damage as we can manage.