They do not call off chases even once started even when they escalate past the acceptable risk. Fact.
That is NOT fact. Maybe where you live, but not where I live. We call off more pursuits than we finish. So, get your FACTS straight or stop labeling them fact. It is a matter of training and accepting. Not all departments have solid policies, and like you said, some that do ignore them. I am proud of the fact that I don't work in one of those departments. I'm also quite sure that my department is not alone in this. I do remember, about 15 years ago, when this change started to happen. It took about 5 years to fully implement, but I can tell you right now as I said before, if an officer in this department was engaged in a pursuit like this one, he would have a very difficult time keeping his job.
Ask the kid's parents in the Detroit area that the cops shot and killed as he allegedly "charged them" from the bottom of the basement steps with a steak knife. 18 shots but only 10 hit him. duh. The kid was deranged, the parents knew it and told the dispatcher when they called and the cops were called to help. So they killed him..... Cops are proven to not be able to decide which "perp" to shoot or not so that is why the public sues them not because they do not want the bad guys off the street.
So, what would your resolution be? The kid was deranged, armed, and apparently so intimidating that the parents called for help. Should the officers have simply retreated and said, "Sorry, call us later when he isn't charging us with a knife"? You seem to think that the cops were hoping to kill him.
Have you ever had someone charge at you with a knife intending on plunging it into your chest until you are lifeless because they weren't of the right mind, either due to some mental defect (be it mental illness or drug induced)? Have you ever actually seen how long it takes for a person to close the gap of 21' that is armed with a knife? Have you ever tried to shoot a moving target while retreating for your life? If so, were you 100% accurate?
I don't know any of the circumstances behind the shooting in the Detroit area that you mention, but I'll wager money that you probably don't know much FACT about it either, only what you read in the paper. Well, having been involved in countless dozens of situations that have made the paper and seeing how it was reported, I can tell you that Thomas Jefferson was correct when he said, "The man who reads nothing at all is better educated than the man who reads nothing but newspapers."
By the way, in case you are wondering, have you ever seen what a deranged person with a knife is capable of? If not, click on the following three very graphic images, and you'll see just what a risk a person with a knife can be:
Knife Wound 1 Knife Wound 2 Knife Wound 3
I don't know why this gets under my skin so bad but it really does....
I think I may know why. Because you feel helpless about a situation you are passionate about. That is very common. Perhaps it would be better to fully educate yourself about the issue at hand and work to improve it.