Indeed. Removing entire topics is nothing else than censorship and that is not the way of science.
On the surface you are correct. But it is not an absolute.
If I was in a message board trying to have a discussion and a small group was yelling about how the earth was flat or 2+2=5 I would want to shut them up too. Putting up debunked junk journal links proving 2+2=5 that link to further lies does not help.
In a public place you cannot shut them up, you must leave, argue or put up with it. In a private setting that you control (like Reddit) you can ban them.