I prefer Milton here:
“Though all winds of doctrine were let loose to play upon the earth, so truth be in the field, we do injuriously by licensing and prohibiting to misdoubt her strength. Let her and falsehood grapple, who ever knew truth put to the worse, in a free and open encounter.”
In my experience people only give a fuck about voltaire when they don't happen to disapprove.
I don't see what this has to do anything. Sure, if an article in a newspaper is censored by a government I fully agree.
If I am on e.g. a technical list or attend a conference, I'd expect discussions about the subject-matter and offbeat comments about gender, race, or whatever.
Maybe the spirit of Voltaire's work is captured in this proverb, but Voltaire never actually said or wrote this anywhere.
Apparently it's a phrase from a biography of Voltaire by Evelyn Beatrice Hall.
"I disapprove of what you say, but I will defend to the death your right to say it."
(And yes, I am aware he didn't say these exact words himself.)