Why should he have a plan for securing America's campuses? The President is responsible for the Defense of the NATION, not individual institutions that are either run by State governments or private groups.
I do not disagree with you. Perhaps a better phrasing of the question is this: Given his stance that we need to take steps to ensure that people are better defended against psychopaths, what recommendations would he propose?
I personally advocate for much more liberal (like in the state of Virginia, unlike the campus of VT) conceal and carry laws. At least then the meat targets can shoot back.