If all of the currently released facts hold to be true, there would not really be any special or significant changes in law to support federal death penalty proceedings for the order givers in this situation.
Murder with automatic weapons under color of authority is about as serious as aggravating circumstances get. The clincher is not so much the initial shooting, but the purposeful delay in medical care. The location was "secure" in a matter of minutes, not the hour they decided to get the guy to bleed out. He was badly wounded, but quite possibly talking. Probably what happened is one of the officers pretended to be sympathetic, got Guerna's side of the story and then decided that side of the story needed to never be told to anyone else again.
I mentioned in another forum that the video of the raid looked "a bit keystone", and the SWAT "officers" also appeared to be on the young side, very young at that.
Someone made the decision to dress those people up and send them in without a whole lot of proper training, gambling the lives of everyone involved on what, "trial by fire"?
The previous writer is also right about that situation of the "theme music" being played in the rig on the way to the hit. I have heard differing opinions of this in the military and PMC settings. One big criticism of Wolf Weiss and Crescent Security was the constant blasting of heavy metal music in their rigs while on convoy protection duty but that was also to keep people awake and break up the monotony on long convoy missions. It is also a point of contention in several military units, but also one of the main reasons military vehicles don't come equipped with stereo systems (although a lot get retrofitted on the side).
I think what will happen though is sufficient evidence will be uncovered which crosses the gap between civil liability (which is already there) to blatant criminal liability under current law, no revolution needed. Even at that, I do see what would be a federal death penalty case in the making.
What makes this "let him bleed out" situation different from the Phillips and Mataseranu bank heist shootout is the Guerna shooting was a police initiated and police escalated confrontation. Too many experts are coming out with too much expert opinion to really make this the kind of case that a slick dope indulgent lawyer can just sweep under the rug.