>>JoeAlt+(OP)
He doesn't seem like a sociopath. More like a power-hungry narcissist. He expressed regret and hesitation multiple times over (what he thought were) the murders, but simply insisted "it had to be done".
Not to detract from your point. I think he deserves life without parole for the attempted hits by themselves, ignoring every other charge. (Despite the fact that's not what he was convicted of.)