the 21 foot rule with almost 1 million views that was on Tosh 0

21 foot rule knife guy almost wins against drawn gun

Police departments going against the 21 foot rule

"So in our instance, the officer can simply back up — giving himself more than 21 feet. He can put something like a table or a car or even a wall between himself and the man… Anything to prevent imminent danger to himself or an innocent bystander." read more http://wsls.com/2016/03/02/the-21-foot-rule/ (they are figuring out that there might be other ways to deal with a person with knife at 21 feet besides shooting them. Those methods were figured out and well known for hundreds of years before the invention of the firearm and the dumbing down of the American people. Backing up doesn't really work, but it shows you are thinking.)

The solution to people with knives is controlling the distance

"You don't have to retreat, but you do have to move your feet."- 21 foot rule guy on how police can deal with knives without dying and without necessarily shooting someone.

Among reforms discussed at length were retraining all officers in deescalation tactics and abandoning training that teaches the “21-foot-rule” — a turn of phrase taught to nearly all current U.S. police officers that is often interpreted by officers to mean they are justified in shooting any suspect with a knife or edged weapon who comes within 21 feet of them.
Read More: https://www.washingtonpost.com/news/post-nation/wp/2016/01/29/police-chiefs-consider-dramatic-reforms-to-officer-tactics-training-to-prevent-so-many-shootings/