Because, in most cases, its a stupid argument and a requirement that only restricts law abiding citizens. Criminals don't care about laws in the first place. It

Because, in most cases, its a stupid argument and a requirement that only restricts law abiding citizens. Criminals don't care about laws in the first place. It's a way for certain politicians to appeal to a certain base that, in the end, helps no one in any way that was proposed. Get into a boxing match and stipulate that both boxers must have their right hand secured behind their back. You step into the ring to find your opponent has chosen to ignore that rule. The ref tells you that while you must keep your hand tied or be disqualified, he cannot deal with your opponent's lack of respect of the rules until after the match is finished. How exactly did that rule help you? Some people disagree with the law, some people think it's the beginning of slippery slope that leads to confiscation, some people don't like their rights being used as a cheap election gimmick. Take your pick.