I totally disagree. Censorship in any terms you have to be carefull with. If you go down that road at least have a clear and visible posting rules eg lige Reddit:
But again - please dont ever just delete a thread because you dont like it.
You can look it the other way around - if there is something wrong with the content of the posts in your forum it could be because something is wrong with the site - not the users. Is it clear how to find relevant topics, did the users get the right help to be lead in the right direction after posting?. Do you have a good team of friendly moderators…
But dont blame the users and kill the forum by censorship.
Just my 2 cents.