concealed weapons are not the issue.
if you take the trouble to get your fucking concealed weapons licence, i'd bet money you are a law-abiding citizen who plans no ill will. the issue (or so it seems to me) is the ready availability of guns. no kid planning on shooting up the school, will go get a fucking LICENCE. he will go buy a gun (very easily accessible in the US) and do his shit.
the problem is ease of access, not certification.
also:
why is nobody worried about where the wackos are coming from? before 2002, these school shootings that everyone is using as reason for carrying a gun did not even exist. now, suddenly it's taken as fact that they will continue, and we should all carry weapons to prevent it.
where did these nutters come from? why is nobody worried about this shit?