The only reason we need guns is because other people have them. Man can use technology to throw bombs at his enemy, but then his enemy can also throw bombs at him. My point is that we should have no guns in the world or very few restrictions on guns, because if other people have guns and we don't, we can't defend ourselves. The most common argument against banning guns is that a criminal hell-bent on killing people is going to find a way to get some anyways, and I agree with this argument.
Also: what's with the arguing about the magazine size? Does it really matter if his magazine carried 30 bullets or 20 bullets? In very specific cases it may mean the difference between life and death for a person, but this person did not kill 6 people because his magazine was to big, he did it because he was crazy.