> allow racists to explain their ideas and positions and the tenability of their position will be exposed for the naked fear and hatred that it is

People are pretty susceptible to passionate speech by charismatic figures; much more susceptible, in fact, than they are to facts. This just seems like an opportunity for racists to win hearts and minds.

And anyway, there's tons of open and free debate on college campuses (at least, there was, when they existed in The Before Times), but generally it's debate about methodologies, not ideas. Everyone's more or less on the right (which is to say, left) side of history, they just have different ideas about, how to, for example, dismantle systemic racism, or end homelessness.

Though probably the more frequent topics for debate are more along the lines of beer pong strategy.