"I disagree with you but I would fight to the death your right to disagree."
As for Voltaire, he would have us tolerate intolerance and prejudice for the sake of conformity and gratification. Exactly the kind of public mentality one finds present just before everyone major political upheaval in history that led to a situational dictatorship.
If you don’t agree with something, you need to voice that opinion out loud, not cower under your blanket of submissiveness or political correctness. Not all ideas or movements are worthy of tolerance. Anything that would harm, physically, mentally, socially, are not tolerant worthy. In this, Voltaire was a bit of a hypocrite seeing as how he wasn’t prepared to tolerate a lot of the actions and policies of the church. Apparently his personal altruistic idealism did not extend everywhere.
I like Voltaire in many respects, but in many cases his liberal extremism is too "extreme." All people are not born brothers and sisters. In a perfect world, which is the delusion of many a liberal, he would be a philosopher king. In the real world, the one we actually live in, if he had any political power, he probably would lead the system to crumble under the weight of its own corruption.
He was an idiot, although perhaps, a loveable idiot. Still though, an idealist, which I have little use for, myself being a realist with no use for hope and wishful thinking.
By the way…
"I disapprove of what you say, but I will defend to the death your right to say it."
Although this statement if often attributed to Voltaire, he didn’t actually say it. It was a quote from another writer who attributed it to him as a summation of his personal philosophy, not his actual words. If I support rapist and agree with rape culture, anyone care to defend my right to say it?