Ideally, you're right. And of course, it should never be illegal to express ideas. But private places like universities have the option of being selective about what should be taught to children. Maybe someday they will be.

Ironically, many of those who shout the loudest about diversity and tolerance are the least tolerant of ideas that oppose their own. Any conservative group on a university campus could tell you about that. And for some people, "diversity" just means differences in skin color and heritage, as long as they all have the same "correct" political philosophy. A really diverse university or media office, for example, would theoretically have about half of their employees being conservatives.