This was kind of the thesis for The Coddling of the American Mind, which describe the first generation of bubble-wrapped, everyone gets a trophy kids, whose parents were always their to solve their problems. When got into college they were very receptive to the trigger warning / safe space ideology being pumped into their heads because they never developed any skills for dealing with adversity. Rather that confronting and debating uncomfortable ideas, they instead throw a tantrum and demand that an authority remove the source of their discomfort.

This article misses the underlying ideology at work, but it does help explain why this crap exploded on campuses when it did.