I just posted in the other thread but that'll probably soon be deleted for somehow being off-topic. So I'll post it here anyway.
You guys are missing the point about gun control. I believe that the main factor with this is the fact that guns are SO easily accessible in the US and that anyone can quite easily just decide to shoot someone and make it happen within such a short space of time.
I mean, if I wanted to, I can gradually stockpile explosive material and detonate a large bomb in a city centre, but that requires time, planning and forward thinking. The same thing here in the UK (due to our strict gun laws), I cannot easily obtain a gun from my house or a friend.
Now anyone can have a few moments of madness, depression or a bad day, (as the majority of these 'killers' are NOT hell-bent criminals) and when guns are so easily to hand as they are in the US it is VERY easy to forget all sense of right and wrong, think "screw the consequences, what do I have to lose?" and simply go out and murder people, often taking your own life afterwards. If the gun laws are tightened these situations would undoubtedly drastically drop in numbers, the only few that remain would be from truly disturbed people or terrorists that plan weeks, months (or even years) in advance for some political or similar gain.