Well said, JTapia. And I disagree with calling my view of police "reactionary." I said police are reactive, which is different from having a reactionary view.
I don't disagree with the idea that police help create stability that lowers crime. But roughly 16,000 US homicides per year attest to the fact that if someone is going to commit a crime, they will succeed unless physically stopped.
I once had a friend who walked into her house after work one night and was assaulted by a guy with a pair of scissors, brutally raped, and left on the floor as he stole her car and fled. It didn't matter that the neighborhood windows weren't broken, the sidewalks were free of drunks, etc. Even if she had been able to make it to the phone, her attacker had cut the line. If she had been armed with a gun, she would've had a chance. Even when she got to the corner gas station afterward and called the cops, it took them half an hour to get there.
Police can't be everywhere, and once a violent crime has started it'll almost always be over long before they arrive. The right to protect one's own life is one of the most basic human rights -- and people like Obama seek to take it away.