It's customary for presidents to visit disaster sites.  What a particular one says or does determines whether he's using it as a "ploy" or not.  While most would have rather he had stayed away, I think it's a bit harsh to criticize this guy for showing up.  Presidents rarely have anything of substance to offer in these cases.  This one will demonstrate his real intent when he makes the decision to spend money either on his wall or on this recovery.