A masked guy breaks down your door w/o an Article III warrant absent exigent circumstances? Yeah, I’d agree. Trick will be that pressing the murder charge would be federal since a federal agent dies in the line of official work (though illegal), which would give the president grounds to push for death.
That’s really the crux of the issue. The law doesn’t matter when they’re going to kill you before you see the inside of a courtroom
If a person is going to kill you no matter what, what do you gain by not killing them?