A university, IMO, has to teach facts, but also teach a process of solving problems.   Excluding those of contrary opinion does not teach a student skills that will be useful later in life.    If a discussion creates conflict, then you teach resolution skills.

Why would a confident administration not want to discuss opinions/behaviors the student will face in their future?   We're not BYU we're a public university with students from many different life experiences. *Actually would bet on BYU on some things!

Lot's of people feel there's only one true/good value system, their own.    That attitude does not like contrary opinions.

 Is there a human values that is universal for all people?   (A thought process/behavior choice)

Is there a perfect set of value and it's only a matter of discovering it for yourself or, accepting it from authority?   (Who's authority?)