Should colleges allow controversial speakers to speak even if their views differ from those of the students?

Colleges should defintiely welcome speakers differing views. Students should be exposed to all viewpoints and worldviews in order to create their own beliefs. Banning speakers, specifically because you don't agree with their viewpoint, infringes upon the attainment of knowledge. You never have to agree, but it's always important to garner knowledge, because if you don't.... you have no true reason for arguing against it.