Is the immediate lethal threat in the room with us right now? I hope no one ever accidentally believes you're an immediate lethal threat simply for existing, or at least if they do, maybe you'll be lucky enough to not have yuppies on the internet trying to defend your murder.

Can the officers in any of these incidents even articulate a threat, and how the only remedy was to shoot through the driver side window, or in the back of the head?

The presence of actual patriotic Americans who believe in individual liberty and limited government is an "imminent threat" to the agents' fantasy narrative where they're heroes doing good. Everything downstream of that is rationalization.