A lot of people were very upset that Ahmadinejad was allowed to speak at Columbia University.
Now that he has had his say he has shown many people in the United States exactly how evil and stupid he really is. I think it was a good thing Columbia let him speak. They should show the same fidelity to free speech in all their decisions regarding speakers.
The First Amendment insures a free market place of ideas. While just like the economic free market the free market of ideas is not perfect it is the best system yet designed.
So let the market place do its work, let everyone have their say. Even the evil lunatics.