MrMarcello
In a well-ordered universe...
Their training has too many militaristic elements to it and many of them are ex-military. They see people as the enemy.
I'd be inclined to say a good portion of them were bullied in life by other kids and have plenty of unresolved, repressed subconscious feelings that lead them to become LEOs to exert control and power over others. And that feeds into a system that protects such behaviors - cops can rarely do wrong it seems.