How about you need to buy a license in order to buy a gun, and if you illegally shoot someone (legally would be if they had killed you in the past) you lose your license, and you need to re-buy one to legally buy a gun. This would cut back on the RDM/DM. However, this would not fix people picking up weapons on the street and using those. But, if you need a license in to buy a gun, less people will have them, right? Just a thought!