Yes, that's a good point.Peter wrote: My point is I suspect it's nonsensical to ask "If everything was the same except for that karma, would he still have been hit on the head with rocks?"
I still feel I'm missing something, because it feels like I'm not getting a straight answer to the question I was trying to ask. This probably means that I'm really confused, since I doubt that there is a conspiracy going on here to "deny information..."
Perhaps I should try it again:
Kamma is intentional action performed by cittas in a particular mind stream. Does what is described as "the ripening of kamma" happen only in that same mind-stream?
Clearly, actions by one mind stream can condition other mind streams (e.g. by injuring or killing). What I'm trying to understand is what extent that should be regarded just "regular cause-and-effect" (i.e. not "ripening of kamma").
I keep getting the feeling I'm painting myself into a corner...