I don't think this is really about free speech in the sense of the First Amendment. Universities are supposed to be about the pursuit of knowledge, and it's pretty unlikely that conservatives are wrong about everything and liberals are right about everything. Moreover, I don't think any reasonable person would say that any historical political party has ever been correct on every issue. So again it's quite unlikely that the present-day left is the first ever exception to that pattern.
You mentioned white supremacists, but I think you're focusing on a fringe and extreme element of the right in an attempt to discredit all right-leaning speakers. There are similarly fringe left-leaning speakers, and a lot of interesting, well-spoken, articulate folks in between, so I don't find this argument very compelling.
You mentioned white supremacists, but I think you're focusing on a fringe and extreme element of the right in an attempt to discredit all right-leaning speakers. There are similarly fringe left-leaning speakers, and a lot of interesting, well-spoken, articulate folks in between, so I don't find this argument very compelling.