People are a little more sentient than an animal when it comes to taking a life, generally. True there are various psychopathic tendencies that can manifest themselves but they should have been screened long before a person hits the street.Then they should be put on retirement at that point, become a fireman if you need the excitement, but not going to remain an officer.
Here’s where my psycho creds hang out. I think that too many people forget that the individual does owe to the greater good if they expect to reap any benefits from society at large. That’s the extent of my collectivist mind. There’s some folks can’t play well with others under any circumstances and need to be culled if they won’t self segregate.