Speech and ideas of all colors need to flourish. That's how bad ideas get discussed and stamped out: think of natural selection. Right now we have a situation where groups are too afraid to discuss so these bad ideas fester in their own filter bubbles.
On Liberty: Society can and does execute its own mandates: and if it issues wrong mandates instead of right, or any mandates at all in things with it ought not to meddle, it practices a social tyranny more formidable than many kinds of political oppression, since, though not usually upheld by such extreme penalties, it leaves fewer means of escape, penetrating much more deeply into the details of life, and enslaving the soul itself.