The vast majority? No, of course not. But a sizeable fraction are, and two things happen because of this: 1) they ruin most spaces when there aren't robust mechanism to keep their people out or their behavior regulated. Nextdoor has shown this, along with most unmoderated internet forums. 2) the fuckwads are frequently able to rile up others and get them to go along with their awful actions; we saw this in Nazi Germany for instance, and many other places throughout history.