The problems on campus life today are not about free speech. They are about how the students have absolutely nothing to do with their lives but sit and listen to lectures, find the best parties to attend, and otherwise discover first-world problems to stew about and protest. That's the root of the problem. This is not a commercial environment where people are incentivized to find value in each other. Campuses have become completely artificial 4-year holding tanks for infantilized kids with zero experience in actual life in which people find ways to get along. These students are not serving each other in a market exchange, and very few have worked at day in their lives, so their default is to find some offense and protest. It's all they've been taught to do and all they know how to do. Idle hands and parents' money = trouble.
There is nothing virtuous or noble about being "tolerant" of people whose attitudes and behaviors you approve of. If you don't defend the freedom of even those individuals whose attitudes and behaviors you find disgusting, narrow-minded and offensive, then you are not tolerant. To "tolerate" doesn't mean you like it or approve of it; it means only that you ALLOW it to EXIST--i.e., you refrain from violently interfering. The people who look to "government" to FORCE people to be "nice" are not tolerant.
In the natural sciences, some checks exist on the prolonged acceptance of nutty ideas, which do not hold up well under experimental and observational tests and cannot readily be shown to give rise to useful working technologies. But in economics and the other social studies, nutty ideas may hang around for centuries. Today, leading presidential candidates and tens of millions of voters in the USA embrace ideas that might have been drawn from a 17th-century book on the theory and practice of mercantilism, and multitudes of politicians and ordinary people espouse notions that Adam Smith, David Ricardo, and others exploded more than two centuries ago. In these realms, nearly everyone simply believes whatever he feels good about believing.