Your first paragraph--I don't see a connection b/w Civil War re-enactments and school shootings. If you can show a link between a mass shooting and a family trip to Gettysburg, or a screening of Tora! Tora! Tora!, or a magazine or gun exposition, please do so.
Second: I don't think civics class (to the extent it's even taught anymore) plays a role either. I think the rights enshrined in the Bill of Rights are normal and pretty close to ideal in most cases. Teaching the 2nd Amendment is far different from teaching a person that murder is okay.
Third: Most of your last paragraph is just nutty, and I think even you would admit it's a bit over the top. I don't own guns, and don't plan to; but I think it's plain that the right to own a gun goes beyond some perceived right to kill people.