I'd much rather go to a school where everyone looked the same but thought different, than a school where everyone looked different but thought the same.
Your line of reasoning is the perfect example of this: https://en.wikipedia.org/wiki/Paradox_of_tolerance
"Why are you tolerant people so intolerant of my desire for a world without all this tolerance? I thought you hypocrites were tolerant!!"
The author of that comment does not want everybody to look the same, it was just a rhetorical device - the problem is not that people don't look the same, but that looks is everything that is considered. The opposite of "caring only about physical diversity" is not "demanding physical uniformity", it's "demanding diversity not only in genetic traits but also in other aspects". I am old enough to remember when the need for diversity was explained as "we need people of different background with different ways of thinking, because that would lead to greater intellectual outcomes as individual biases would be compensated and cancelled out". Now it's "we need people of different genetic background because if you don't agree with it than shut up, racist!". Somehow the old one was way more intellectually satisfying than the new one.
Regarding tolerance - you do not see conservatives trying to no-platform liberals, but I could get you 100 examples of college liberals trying to no-platform conservatives. Who exactly are the tolerant ones?
Did you see what happened to Bret Weinstein at Evergreen College? He is an ostensibly liberal guy, and what happened to him should send a shiver down the leg of anyone who is remotely interested in a free exchange of ideas.