You can't put a jew and a nazi into a room and say "have a free thought discourse". Or a (american) white supermarics and (american) person of color. Or a homophobe and a gay person.
There can be no discourse when one side wants just to be left alone and the other wants to exterminate them.
You might want to rethink that 20th century lesson.
> His efforts to fight racism, in which, as an African American, he has engaged with members of the Ku Klux Klan (KKK), have convinced a number of Klansmen to leave and denounce the KKK.
In fact, bringing people of different minds together is the only way to have free discourse, and the only way to change minds.
There can be no discourse when one side wants just to be left alone and the other wants to exterminate them.
You might want to rethink that 20th century lesson.