I'm feeling better now so:
The DC sniper had a stolen weapon. Neither shooter could legally own a weapon.
The Assualt Weapon ban is a joke. I have 2 weapons that if I replace their Fiber stock (the part you hold) with a basic wooden stock makes them not an Assault weapon anymore. Also my hunting rifle shoots a bullet further, with more energy, and much more accuratly than the 2 Assault Weapons. The difference is the Assault weapons cost 11 cents per round to fire verses $1.23 for my hunting rifle. My 2 WW2 Russian surplus rifle also fire further and more accurate than the Assault rifle.
As far a more guns more crime see
http://johnrlott.tripod.com/ He is the only person I know of that has not been disproven by anyone in his math or methods that he used to get to his conclusions.
To purchase a gun in the USA you must:
1: be of legal age and can prove it (legal form of ID).
2: fill out a Gun Purchase form. If you lie on the form you have commited a crime (Felony).
3: There is then an instant background check to see if you are elligable to purchase the gun. If you pass, you can then
4: pay for the gun.
To purchase Alcohol you must be of legal drinking age and can prove it.