[maxerickson]

Even if you do something like assume a bimodal distribution with small variance, the mere presence of protests doesn't tell you much.

It's not even particularly clear to me that protests have gotten more frequent. When I was in school 15 years ago there were enough protests; I just ignored them...

[sinxoveretothex]

Well, yes, if you're asking are there more or less of those things we'd call "protests", then it's not clear at all that there are any more or less than at some other point in time. I mean, I saw a protest on the street the other day: it was two guys and a policeman…

You'll notice however that is a far cry from a representative summary of my point.

Anyway, there are people who've researched this, notably Jonathan Haidt. They created a website to talk about the problem here: https://heterodoxacademy.org/ . And they think that there is a problem of shrinking viewpoint diversity in the social sciences. My experience is that it's gotten worse, but we don't seem to be able to agree on that.