terrorism and the fear of a mumbai type attack against students

I want to apologize in advance to anyone who does not want to consider the horrors of terrorism.  this is only being written in the hopes that if what is suggested were to come to pass, that someone would be prepared. Terrorism is a constant theme in our society, but one which we largely chose to ignore.  It makes life more pleasant.  We have learned, in our complacency, however, that the terrorist is the most barbaric and inhuman of adversaries. They have no regard for the pain they give to others and this is reflected in their lack of concern for their own lives.
It means that we must be vigilant and we must not shirk from the worst horrors imaginable which is a pleasant thing to these monsters and make no mistake they wish to be monsters and therefore they make themselves into them.
The recent threat to various colleges raises some disturbing possibilities, the least of which is that it is a prank.  The worst, I believe, is that they are conducted by terror monsters.  In which case we must discern their purpose.  I believe that an armed populace is necessary for us to defend ourselves from outside threats and our own government.  However, the availability of guns to honest citizens implies the availability to criminals and worse still to terrorists.
Mumbai gives an example of what can happen when terrorists are combined with weapons in a peaceful population.  The Tet offensive is a more rigorous example.
What worries me about the evacuations is that it could be a method of targeting the young.  In school, they are in a controlled environment where they can be "locked down".  But if they are evacuated during a bomb threat, they can be moved, using the school staff, no less, to an uncontrolled environment along a known path according to the timetable of the terrorist.  This type of scenario is one reason why almost no type of response is too violent to terrorism.
The solution would be difficult, but I can see two ways of ameliorating the threat.  1) Make sure that when schools are threatened that the police presence in the evacuation routes is heavily increased.  2) Train the students in techniques for protecting themselves in the event of an attack and make sure they understand that a single method may be ineffective if the terrorist are aware of it. 3) This one is added-I think policing regularly and with experienced anti-terrorism experts the routes that would be used for signs of such an ambush would make sense and would be more proactive than the other two.  I'm sure there are other ways to protect against this type of terrorism and I hope that others who understand consider this and other scenarios that are suggested by the rash of threats to universities, so far benign.