Thugs by and large buy guns illegally. Thugs won't abide by any gun laws. So, if you outlaw guns completely in hell-hole cities like Chicago, will the thugs decide to stop buying guns illegally? Will thugs decide that since all guns are illegal, they'll stop killing and robbing with guns?
Disarming law-abiding citizens is a boon for thugs in these cities. For those who think the police will be able to thwart a murderous thug who is threatening your life, remember the saying:
"When seconds count, the police are an hour away".
You mean when seconds counts, a social worker is an hour away.