My "theory" is that law enforcement organizations in america are extremely corrupt and have actually became a cartel organization just like Mexican cartels or far right large militias (yeah, they pretend to be saviours of the nation but they sell guns and drugs just like any other cartel). The power available is huge and the funding is also huge, probably the most "rich" police force all over the world.
This is the only way to explain the amount of people with ASD that get selected to become a cop. Those kind of persons are needed in a criminal organization: they are fearless and they are remorseless for those who stand in their way.
A lot of problems would probably be solved with soft skills, but due to the profile selected, those kind of cops will get bored if they didn't kicked someone's teeth inside their stomach that day.