It seems to me like you are implying that not shooting a civilian in the head 3 times - two of them from the side of her vehicle when in zero danger - is an "impossible standard". I think it's a pretty basic standard, along with not calling citizens "fucking bitch" after you killed them. Along with allowing medics to provide aid to the person you just shot. And not leaving the scene immediately with your firearm. Along with the entire Federal government not dragging her name through the mud and calling her a terrorist before an investigation even began.
I think these should be considered bottom of the fucking barrel standards. And neither the agent nor the Federal government lived to to these basic standards. It's not just about the (senseless and evil) shooting, it's the entire shit sandwich.