That's why I like the cop's maxim "I'd rather be judged by twelve than carried by six". That applies to me as well and if the cops come into my home or property, they are as likely to get shot as any other "perp". TH GP's GF included.
Cops that kill someone should be, in all cases, tried for capital murder. If they are innocent, they have nothing to worry about, right?
When I serve on a jury, I presume that everyone, including the cop and the prosecutor, as well as the defendant are lying. Starting from that point, I determine who might be lying less and make a judgment about what really happened accordingly.
I believe that most, but not all cops start out wanting to do the right thing, but become, in most cases, as bad as the criminals they attempt to control. It is unclear to me how to fix this problem, but I know never to trust a cop. They are not there to help you, except as that aligns with their desire to help themselves stay alive.
Cops are paid to do a job, just like most of the rest of us. I don't see any need to claim they are doing something noble. Their salary and pension more than make up for any risk they assume. Cops should remember, but often don't, that they are supposed to serve *all* of the people and put themselves second, always.