You'll just piss off both sides by being reasonable. A lot of this info exists, but isn't correlated or understood. As poster after poster has pointed out the discussion about guns has become about being right, not about doing anything. As far as I can see there has to be a rough agreement on the bounds of regulation before anything else will be done.
I haven't read every post but there is another elephant in the room. Race. The vast majority of gun rights advocates are white, the vast majority of victims and criminals are people of color. The discussion becomes for the whites: you shouldn't take our guns because they (people of color) can't control themselves, and we need our guns to protect us from them. As for the violence: well, it's just a form of natural population control.
When I was told this by an old cop I know, I was stunned. I said I didn't agree, but didn't try of convince him otherwise. I just wondered how to go around him.
Oh, as for the massacre of children, it was a random aberration and can't be controlled. This conversation occurred around the time of Columbine.