” Why would they think thus was okay?”
Smart-ass, juvenile, disrespectful, anti-religious college idiots. BYU and the LDS folks don’t make a big stink about it, but this sort of thing happens to them quite a bit. Whenever Stanford and BYU play, for example, Stanford’s smart-alecky band takes a lot of cheap, mocking shots at Mormons. They do the same thing to Catholics when Stanford plays Notre Dame. This sort of attack on a religion is not only offensive to the opponent school, it’s also particularly insulting to members of those religions who are Stanford students/faculty/staff.
The band plays Osmonds songs?
Liberty University gets picked on by the demons.