If I were a killer with intent, I would just walk around that thing while my targets' vision was obscured by same and do what I came to do anyway. Either that or just stomp that plywood contraption down on the ground.
I can get worse.
Liberals would likely go so far as to mandate in the building code that schools must have bullet-proof panic rooms that can hold each classroom full of students.
The stupidity of these people is simply staggering.
But I thought the meme was assault rifles being used everywhere! And an assault rifle will plow through that rather easily.
Use their own memes against them.