Milo wasn't harassing anybody, except by the broadest and most over-sensitive possible interpretation of the already diluted word 'harassment'. Milo himself never did anything to anybody other than toss out singular, one-off quips about people. But people like to hold those with many followers responsible for what their followers say. While it's emotionally tempting to do so, it's also stupid, unworkable, and ultimately always serves as the go-to excuse to ban someone with the wrong views.