Chip,
There are only two alternatives as I see it:
1. Simon is the PF hacker.
2. Someone hates Simon enough to attempt to convince people by the actions carried out by the hacker, that Simon is responsible.

The reason I don't believe it to be the latter is that actions have been taken against certain people where only Simon and a few others are aware of the fall-out between these people.

As much as I know that even you are capable of doing it technically, the people that have been targeted wouldn't fit your profile / nature. However, given your friendship with Simon, it certainly would not suprise me to learn that you passed on the information of how to hack the board on to him - if he needed that information . I do not believe it is you though.

All the evidence points one way and one way only. As you know I am a very logical person and if you were able to offer an explanation that fitted all the circumstantial evidence and pointed in a different direction, then I would quite happily investigate it further. Simply saying you don't believe it to be him, when everything fits doesn't make sense to me. If you could provide some alternative reasoning, then that would help me see where you're coming from .