Should controversial speakers (on whatever subject) be allowed on college campuses?

For the most part yes, however, I think it is appropriate for the school to decide whether or not the speaker will add something to the discussion. It does not necessarily need to be what those selecting the speaker agree with, it may present another side. I think it is important though, if we are going to ask faculty and students to take time out of their busy schedules, that the speaker have something to add to thought and discussion. I think if the speaker is to be paid that it may be relevant to consider additional elements such as moral or social implications. For example, it may be interesting to hear the head of the KKK speak even though he is highly controversial but I think it would be fair for students to demand that their college money not be used to bring him to campus. They would have a right to demand that their money not go even indirectly to support this organization.