Scientists should make an extensive psychological study of the profound mental changes that sometimes occur when a man puts on a uniform, a badge, and a weapon.
The recent killings of unarmed individuals by policemen have all the signs of prepotency, in other words:" I am powerful and you are weak, so submit to me".

The military can tolerate such individuals because they make good soldiers, but cops should learn humility when confronting civilians as in:"I am here to protect and serve."