Probably what he's going to face out here. While I'm sure some of the political elite are howling "death penalty" they're probably just going to lock him up forever. like they did for Manson.
Or he could win the jury roulette like Rittenhouse, and be free to wander around the country doing played speeches. He's guilty, all sides agree on it. He agrees on it as far as I'm aware. But what happens could be anything between death and easy street riches. All we know for sure is that the money elite are trying very hard to pull the strings on the entire process, and any hint of that is being met with public hostility due to the expectation that they'll get away with whatever they want as usual, no matter how many other people die.
You're right that I assume -- on the basis of many years' experience -- that English judges aren't corrupt, but I'm not sure how that's the question here. We don't yet know what Mangione's case is but, unless it's that he didn't do it and they've got the wrong man, it's difficult for me -- used as I am to English law on homicide and diminished responsibility -- to understand what the defence will be.
On the face of it, over here a premeditated murder, with a considerable degree of planning and forethought, commited for political or ideological motives, would certainly put the defendant at risk of a whole life sentence (life without the possibility of parole) and, if the court drew back from that, would inevitably result in a life sentence with a minimum term of around 40 years or more.
No one is arguing if there was a crime. There was a crime. It was premeditated murder by a sane person. That the victim was also a mass murdering sociopath who assumed (correctly) that he was above the law is also irrelevant. This is a post guilty/innocent world over here. The guilty walk around with impunity as long as they are white, right, and rich. Hell, even if you're a multiple felon and rapist, you can still be president. The innocent, what there are left of them, are simply meat for the machines to chew. Welcome back to the savage garden. It's simply predators and prey, with the legal system another weapon to consume and control. It does not protect anyone but the very wealthy and the powerful, unless random chance makes the wind blow another way that afternoon.
We do not trust our judges. We do not trust our police. We do not trust our elected official. We do not trust each other. We sure as fuck don't trust the corporations who own everything and are the real ones in charge.
You write quite rationally and reasonably from a world I wish we still inhabited here. I would very much like to go back to a place where I did not viscerally understand the issue either. I have nothing but respect for your wisdom and insightfulness. This is simply one of the exceptionally few times I disagree, due to a base cultural divide between the UK and the Raving Insanity of End State Capitalist America.