That's true, but I don't think you can let Paul off the hook entirely. I think those responsible for this situation are:
First and foremost:
Home plate umpire, Doug Eddings.
Second and to a lesser degree:
The rest of the umpiring crew. There's 5 other umps out there, someone else had to see this play and either reinforce Eddings call, or overrule it. They did neither during or after the game, and I thought after the game their silence was deafening.
Third and marginally:
Josh Paul. Tie game. Ninth inning. ALCS. Close call. Just plop a tag on AJ and your out of the inning.
Fourth and finally:
AJ Pierzynski for pulling a fast one on the Angels.