I may have missed it, but first be sure a handgun is allowed on campus. If not, should you ever have the need to use it in a self defense situation, you will be arrested, but as many have said before, "better to be judged by 12 than carried by 6."
If guns are banned, you may want to look into other defensive methods, a knife, pepper spray or something legal but effective.
Looking at most mass shootings however, they take place where the purps think the victims are not going to shoot back. No gun zones are for that reason, why the good guys should have a gun.

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Certified NRA rifle instructor