The counter was that the police can not be everywhere.
The addendum now is that even if the police are there they will not do anything.
Time and again the LEO's fail out of abject cowardice...Exceptions are rare.(Like the off-duty police officer hero in MD who, the other day, refused to give an attacker a clear view of the attacker's target and took a life-ending shotgun blast to the body at close range.)
NEA-type persons might be more interested in wondering just what the poor, down-trodden attacker had experienced to make him do such a thing...All the while hiding in a classroom closet while gunshots are loud and clear...