Why should campus groups foot security costs for controversial public forums?

It's appalling that $28,500 worth of risk can become a factor, merely should a person decide to hold a public discussion. You see, $28,500 is the security fee the Laurier Society for Open Inquiry (LSOI) was told it would have to pay in order to explore "multiculturalism, borders, and identity in Canada" at a venue at the University of Waterloo.