The comments by "Bruce" don't strike me as markedly more irrational than the posts themselves, and by internet standards they seem not-especially-harassing. I'll admit I didn't devote too much time trying to decipher anything.
If this person is in fact impersonating a real person, then ask that person to press charges for identity theft. Aside from that, just block the user every time he shows up.
You are playing right into this troll's hands. Don't bother responding to him, just delete his posts and ignore him.
You've already spent too much time worrying about this. Disable comments or just let him fade away (i.e. discontinue acknowledgment of his posts). If his pay off disappears so will he.
Mission Hills? That dude is rich! It's probably his only male heir, trying to re-invent my point-based system of materialized karma. Stay out of his way!
Man, I feel for you on this. Find his IP and block it. If that doesn't work, block his entire ISP with a message that they have this guy to thank for it. Finally, ignore him. If he makes a comment, delete it. Don't respond. From what I've seen, you seem to be feeding into his pathology. This isn't a blame the victim thing, but an Internet thing. The guy's a troll and every time you answer him, you reinforce his behavior.