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That's good. We've obviously seen how things can go very wrong with police response to a violent situation. However, even with the best response by police, they are still minutes away at best, and in those few minutes, things can go downhill very quickly. It is good that more people are realizing that, and taking steps to become their own instant response to potential unprovoked violent attack.

To quote Jeff Cooper:

The police cannot protect the citizen at this stage of our development, and they cannot even protect themselves in many cases. It is up to the private citizen to protect himself and his family, and this is not only acceptable, but mandatory.

And

Fight back! Whenever you are offered violence, fight back! The aggressor does not fear the law, so he must be taught to fear you. Whatever the risk, and at whatever the cost, fight back!

And

The only acceptable response to the threat of lethal violence is immediate and savage counterattack. If you resist, you just may get killed. If you don't resist you almost certainly will get killed. It is a tough choice, but there is only one right answer.