The exercise of spreading controversial things can help, if only to make people more aware of their studies, is it all actually correct? Is there any other side to the coin, and is it in any sense reasonable? How easily is it dismissed, maybe it actually does have something to consider. We should never get used to thinking that everything taught is correct, and should always question everything constantly (at least to a healthy amount).
Thought policing is terrifying, surpressing freedom of speech is too. You can spew anything at me anyday, i can dismiss it if i dont agree with it, but never ever would i want someone jailed for saying something to me that i disagreed with.
"I disapprove of what you say, but I will defend to the death your right to say it" Evelyn Beatrice Hall.