Not controversial with politically literate people, but bigots, fascists, racists, homophobes, transphobes, etc., shouldn't get a platform to spew their shit. Public or private, doesn't matter. And any effort by them to acquire one needs to be put down.
It shocked me when my friends pushed back when I explained why Rogan shouldn't have those people on his show with a freeze peach argument. Those people deserve nothing but a sock full of batteries.