The problem with gun control legislation in the US:
*dozens and dozens of shootings happen per year*
*US Government introduced gun control legislation*
*months pass without incident*
*one shooting happens*
US GUN LOBBY: SEE GUN CONTROL DOESN'T WORK! ALL GUNS ALL THE TIME!
And anyway, there are like a quadrillion guns in circulation in the US, you can't just magic them away with legislation.