The truth can stand or fall on its own merits. And we don't need censorship to protect people from having their feelings hurt. If people like this want to publish their "revisionist" rubbish so be it. It only makes them look like fools. But censorship may make the ignorant start to think that maybe the "revisionists" are right otherwise why would everyone be trying to shut them up? Not what we want.
Singapore arrests man who tried to join ISIS (Reuters)
from the article: Greek historian convicted over book denying the Holocaust