I think to answer your question I have to ask another one. What do we consider art?
I don't think art should be censored, no. Do i think that some art should be forbidden, maybe. There are instances when people use artistic media to create things that are not actually art, rather its propaganda, p**n, hate, lies with artistic elements. And this might be confusing because in many cases art seeks to express things that exist outside of itself.
Take for example (and I know this is a little extreme) drawings, videos, or paintings of child related explicit content. They utilize artistic media, and the person who made them might consider them art, but I think most people would agree a lot of it shouldn't exist.
How about a person who creates racist posters that promote violence towards people? I don't think anyone wants that.
But of course there's no way to stop people from making art like that. And it would be a challenge to come up with strict rules that dictate what goes too far or not without giving up artistic freedom to certain degree. After all, there are paintings of mothers breast feeding their babies that some people would call too explicit as if they were the same as child p**n, when most of us wouldn't see it that way. And there are plenty of old cartoons that were kinda racially insensitive that some people might want to erase, but I think a lot of people can understand TV and cartoons don't always age well. Deciding where to draw the line on things can be tricky even if the goal is to get rid of the extreme wrongs. I haven't given too much thought to all of this, but I'm pretty sure I'm not the only one who likely sees what I mean.
In short do I think art should be censored, no. But it's important what we allow to be called art, because anyone can paint, draw, record anything. But not everything or everyone should have the protection of art.