Because many year ago the Americans were giving the privilege to bare arms to fight back against government tyranny. Shame they lost their balls and never used it as was intended and soon there will be total gun control, fuck yeah America!
Till now there is no control over public sale of guns in America,everyone can have a gun without any license i guess i am not sure about that but the market is filled with illegal fire arms so it is quite easy to acquire one if you have the cash.