Please tell me you're joking? You believe that if the police were disarmed the criminals would no longer shoot to kill? Are you batty?
Read this story:
http://www.iol.co.za/index.php?set_id=1&click_id=13&art_id=nw20090411181232143C372133
Now you tell me. Why was this person killed. No police, no guns. I'm pretty sure they would have given them whatever the hell they wanted, and so would most people.
You are absolutely delusional if you think the criminals kill you because they might be shot themselves. They kill because they enjoy killing. They'd enjoy killing me, and they'd enjoy killing you. And if they went to jail and got out they would continue killing, and keep enjoying it. Disarming the police force in a country filled with syndicates, mafioso, militant racists and rapists is probably the dumbest idea ever.