Despite my position amongst the staff...I'm really not a sociopath. The fact I feel guilt for putting a dying mouse out of it's cat-caused misery should be enough to prove that, I certainly hope!
In actuality, Hojo is one of the few villains I have ever actually hated. Typically I'm either sympathetic or amused by villains, but the dear Professor? Ah, I'd much rather torture him 1001 ways before leaving him to a slow and painful death. Perhaps drop him in an active volcano... Despite my hatred of him, I hope to do his mentality justice and not let my sympathy for his victims curtail his actions.
So, I suggest not letting your character try to kill him unless you're completely sure you'll be able to get away with it without becoming an experiment. Because, well, he's not stupid. He expects people to try to kill him. Just look at poor Vincent! TT.TT