Universities are meant to be institutions of learning. Learning isn’t always comfortable. Some long held truths turn out to be wrong at some point. What we all think is true or right right now could completely reverse in a decade. Letting people speak especially when it’s against your morals is important for learning and understanding. Even if it’s bizarre and incoherent, if somebody believes it, we should try to understand why so that we can better educate those who were persuaded.
As an example of the rapid change in public thought and what’s acceptable, almost nobody publicly supported gay marriage a little over a decade ago. Saying you did would result in mockery, people questioning your sexual identity, people bringing up the religious history of America, etc. Now publicly opposing it is career suicide.