“Hero” cop? WTF, that’s her job.
And another thing. WTF’s this deal with rushing over to apply CPR to these a$$holes. If I’m kneeling down it’s to put one last round to his head to make sure he’s taking a permanent dirt nap.
Yes, that is her job. It doesn't make it any less heroic.
As for the rest - it is part of her job to do everything she can to preserve life. That can sometimes mean taking somebody down to remove a threat to the lives of others. But she's, quite deliberately, not judge, jury, and executioner. Her role comes before all of that.
(In Australia we don't have the death penalty in any case - which I wish wasn't the situation, I believe in capital punishment but only after a fair trial. That's a different situation.).