The problem is obsession not the game or activity.
Right on. And on the other end of the spectrum there are parents who get so over-involved in their kids' lives that their kids start playing WoW to try and get away from it. It would seem that some people have a greater propensity for addiction to certain things, but for now I'm still thinking obsessive behavior is still the culprit.
When we write programs that "learn", it turns out we do and they don't.