You are assuming that the person being shot deserves it. UK police shot about 5 people a year. I can think of at least 3 instances where this was totally unnecessary. I.e. drunk man with table leg in his backpack which was mistaken for a sawn off shot gun. Mentally ill teenager with a toy gun. Ditto but with a gun shaped lighter. All with highly trained firearms officers present. It seems highly likely to me that less well trained 'general purpose' US police officers are shooting a lot of people unnecessarily.