I think the most important class-- or classes-- we can have are those that teach critical thinking and problem solving.

Not really interested in the gun debate, but as an extension of that... maybe it would serve society well to teach kids (and people in general) how to problem solve in a non-violent way. I mean, the Swiss have lots and lots of guns, as well... they just don't kill each other with them. Why? There has to be some kind of "coping skills" class that could address the underlying issue.