There is a difference between a tough but normal American exercising their right to bear arms and a paranoid and/or racist nut job.
I highly doubt the founders counted the latter among their peer group.
Re-read what I wrote.
I pointed out that nuts associate with the tough-but-normal Americans. Does that mean we should scrap the Second Amendment because there are nuts who follow it along with the tough-but-normal types? Should we consider the Founding Fathers kooks because some of their followers are?
The Left would love us to use that logic.