Yes there definitely have been some bad actors but you can get that anywhere. As a parent I have seen teens on snapchat make fun of a kid and it gets sent to the entire school. It can happen anywhere. And yes there are lots of nice chill parts of 4chan but also some that are questionable to most people's morals. But the freedom to say what you like on 4chan makes it a very powerful site for both good and bad or those who just don't want to risk their identity being know for criticizing politics as one example. Even here on HN you are restricted on what you can say as HN does have a few guidelines. But I do find HN has a pretty good balance with moderation most of the time. The voting system takes care of most of it.