The only bad thing about his conviction is that the state had to make a deal with his co-conspirator who, IMHO, is just as culpable as he was. They both should be dead. But, I don't have any doubt that neither will be dead in 20-years (save of course for prison-yard justice, which is a possibility).
What kind of “deal” did they make with the co-conspirator? The other guy (with the Russian last name) was actually the one whose idea it was, IIRC. He participated in everything and in fact was even the one who lit the fire. It’s hard to imagine that any deal could have been made to protect him.
I like the old fashioned term, "guilty beyond peradventure".