I would agree that it is very likely that being a cop is unlike being in armed combat, most people that police deal with are not a good match for them, police are protected from prosecution for their actions largely, and they generally vastly overpower anyone who stands up to them.
Although, the LA cops who had to deal with those guys with full auto and body armor have some idea Im sure.
There is that similarity.
And often police serve under very difficult circumstances, but combat is very different from police work.
I think anyone who has served in combat would tell you that.
But to ask someone to kill and die for what you believe in seems substantially different.
If I believe crime needs to be fought and think that police must stop bank robbers is my belief weak since I am not joining the police?
Police kill and die in the line of duty regularly.