Funny.  All the Democrats in the world lose control over their sphincters if a State wants you to produce any kind of ID in order to vote.  However, all the Democrats seem totally supportive of denying someone their 2nd Amendment rights if they were ever depressed, or whatever.  What kind of background check do you think this Vegas guy would not have passed? Besides, you are suggesting that people who commit murder are going to comply with your gun laws.  What planet do you come from?  If passing a law will prevent these killings, why isn't the law against murder working?  A guy willing to kill himself is not worrying about the penalty for having an unregistered gun, or two, or three, or four, or .........