Wow, where do we begin?
First, wouldn't Marquette University, as a private school, be able to disallow anything on campus it wanted to disallow-- just as any other private business can do?
Next, the comment attributed to Spencer Black: "However, Black said the recent shooting incidents on college campuses reveal the need to prohibit guns there. He said keeping those areas secure is a necessity."
Excuse me Spencer, but "keeping those areas secure?" One could only be keeping them secure if they are secure to begin with--- which of course they are not. (As clearly evidenced by you very examples.) [Note--- time to write to Spencer Black.]
Finally, the statement attributed to "Madeline": "If there is a gunman taking down students, do you really think someone else pulling a gun out is going to stop the situation..." Um, yes Madeline, that's exactly what I think could happen. Do you not see that sending in the police is also a case of "someone else pulling out a gun?" Or do you advocate not sending in the police either? It makes little difference to perpetrators whether they are shot by a police officers or civilians. But it could make a difference how soon they are neutralized, saving lives.