More police is not going to prevent an unarmed citizen from being attacked unless there are enough police to be everywhere all the time. Even if every citizen had a gun there would still be attacks on citizens. The only difference is that no one would be defenseless. The school shootings would still happen since those who do them are out of their minds and plan to die anyway. Armed citizens everywhere would absolutely reduce the number of innocents killed or wounded, due to immediate response, but would not, and never will, prevent evil from being evil. No tax, no weapon, no cop will ever remove the risk of attack. However only a weapon in your hand will give you the ability to immediately defend yourself from it.