Its not too hard to fathom another gun owner taking measures into their own hands and shooting this guy. Then, if you've got the two shooting at each other, and the cops show up, what do they do? You've got the two civilians just going about their "2nd 'mendment" day, and now its exacerbated into a whole other issue.
And if this guy keeps showing up at a school bus stop, where are the authorities? Isn't it a bit of a diachotomy/contradiction here?