That alone should have disqualified her from being a political representative.
[Eddington's] motivation comes from awful discussions about kids bringing guns to school.
Yes, I'm sure there were many kids discussing how they were going to go out and spend $10,000 on a .50 cal rifle to shoot up the school.
As far as the "terrorist" angle goes, even if a terrorist wanted to use one of these rifles (which is unlikely), what makes anyone think that they won't be able to obtain one illegally? Hell, they could have hundreds of these rifles--along with more deadly weapons and munitions--walked across the Mexican border with their comrades. Laws only apply to the law-abiding.
Every grade school kid I know of has a penny bank with the sign on it:
"For a .50 caliber to shoot that a**hole that broke my red crayon!"