Why are people who call themselves "liberal" so devoted to censoring opposing viewpoints?

A liberal is not tolerant, they are intolerant by definition. They want what they want and that is it, and the only thing that matters, it's not about majority, it's about minority rules. Then they will say, the reason your question is reported it because it happens to them or this question violates TOS when it's as legitimate as anything they will ask all day.