Sweet Jesus, Rob, the average cop isn't as much of a marksman as you would seem to believe. Many cops only shoot once a year, when they qualify with their duty weapon(s) and maybe the pistols their agency allows them to carry off-duty. Ammo is expensive (the cheapest I've found is $13/50 rounds of 9mm target rounds). Due to budget cuts, there isn't as much training as there might have been in the past. Cops often only shoot more if they're into firearms. I shoot more than the average cop.

Shooting at a kneecap on someone running at you? Danged difficult. The average "hit rate" of cops is something like 17% from the figures I've read.

Tasers don't necessarily immobilize someone.

Toxicology tests are always part of an autopsy.

Obviously, nothing said is going to change your mind. Cops are all hell bent on evil, to suppress the lower class is what I take away from your posts. Sounds to me like you would be thrilled if more riots broke out. After all, the "haves" would have their stuff/businesses destroyed and the "have nots" might get some more of the pie.