You know, people have the ability to choose to either not attend, or attend but not see that speaker. If a packed auditorium cleared out when he got up to talk, he could be not invited back next time because people didn't want to hear him. I think people are more afraid that he will be looked at for more than just the "racist" label they have tried to put on him. Ideas unrelated to his controversy are just that, unrelated. If the creator of "The Onion" kicked his dog one day, it doesn't mean the publication isn't capable of being witty or funny anymore, or suddenly make all previous works bad.