When has the NRA or even an NRA member caused harm to anyone in our schools? Sure there probably has been someone, somewhere, who abused his or her spouse or kids, but the correlation of the NRA with violence of any type anywhere is almost for certain to be near zero or even negative. Get me a citation and then we can talk about it. But violence in the schools? Only in their dreams. Such a correlation would be their favorite wet-dream come true.
What if they had drawn the 2nd Amendment or the Bill of Rights at the door trying to get in? That would have been more accurate portrayal of their true concerns but their ill intent would have been more obvious.
These people are the enemies of freedom and want to knock down all barriers to unlimited government power. Private ownership of firearms is one of those barriers.