Tbh I suspect US coppers **** themselves daily. They've made quite a mess for themselves and there's a real hatred of them.
Don't forget, cops are also getting shot in america. The US would do well to retrain its police force as some really lack the ability to think rationally in a tense situation.
And ours do already, though its rare as there's only ever limited threat from guns, so few coppers ever deal with them. But on 7/7 a Brazilian was killer in error.
oh and I forgot, most cops die from car accidents, with many dying from not wearing a seatbelt