FULL VIDEO: Walter Wallace Jr. attacks police with a knife. BLM burns down Philly after he's shot.

On Monday night in Philadelphia, police were called to the home of Walter Wallace, Jr. for an assault in progress. He was armed with a knife and an imminent threat to the public.

When officers told him to drop the knife, he disobeyed, stormed around the car, and then began to charge at them.

There is no clearer definition of a justifiable use of deadly force than the events that unfold in this video.

I take you through the initial shooting, the subsequent riots, the attacks on the police during the looting, and we close by taking a look at some examples as to why you never meet a lethal threat with non-lethal force.