Dafuq is the deal with "cop killers" being some extra-serious crime?

Cops sign up for that risk, they get armef, armoured and trained for it. They're less at risk of early death at work than soldiers, firefighters, lumberjacks or fishermen.

Cops who betray their oath and harm civilians, now that I could see as aggravating circumstances. But somehow its always the reverse. Thirty-six times more likely to beat the charges etc