The problem with blocking someone is that other people can still see what that person says.

Censorship is only effective if you can stop other people from seeing the information.

It’s not good enough that a user can hide what other people are saying for themselves; they need to be able to hide it for everyone else.

That’s why you see such a crusade by a certain community to ban anyone who disagrees with their agenda. They don’t want people sharing ideas that go against their beliefs.