How many rampaging gunmen does it take to get guns banned?

2 and counting. How many people will have to die because of insane men with guns? If you ban them completely, how much difference will it make? Is it worth doing if drugs are illegal and still as readily available as they are.

Making things illegal makes them more desired and therefore makes the problem worse, but at the same time, surely it’s better to make it as hard as possible for people to get guns rather than hand them over for self-protection, or so the police believe.