Maybe if they wear earplugs...
The same standard package of bullshit regulations and Civil Right infringments is being waved again, in response to a spate of criminal activity. Where such rules have been implemented, the violence, most likely linked to cultural and economic factors, continues.
No matter how many times you push those buttons, folks, the results will remain the same--with the exception of creating entire classes of 'felons' because the rules have changed, but people aren't going to live any differently tomorrow than they did yesterday, and aren't about to meekly give up their stuff.
Disarming yourself in a bad neighborhood makes as much sense as throwing your rifle away on a battlefield.