Normally I don't publish peoples' PMs if I suspect they are being anything less than a total dick, but:
A PM like that ought to be made public IMO, so you'll get zero criticism from me for quoting it here.
I tagged this guy for harassing DT members, which I consider to be a tag-able offense.
I have to admit that I don't know the entire situation, since I can't seem to muster up the patience to read this thread from start to finish, but I'd say you're right to tag him. The dude seems hostile, volatile, and ultimately untrustworthy--and that's what the trust system is for.