Cops are part of a system that is corrupt by nature, ever heard of private jails? they are but simply one cog in the wheel. Ive already outlined common sense policies to alter the way the PD's around the nation are held accountable, those would be a good start.
From a policy standpoint you cant regulate human behavior. So you think if somebody was going to pay the stupid amount of money to own a flame thrower or grenade launcher you really believe they would commit crimes? Doubtful. Just like all the people who own class III firearms that are not shooting things up.
Anyone could today, go into their kitchen and make explosives and napalm..
How do we determine mentally ill? All of these recent shootings wouldn't have been stopped by another law, we already have them on the books.