Wow. A lot of replies so quickly: this one obviously touched a chord out there...
T.A. Harris' enormously successful
I'm OK, You're OK characterises the "I'm OK, You're not OK" orientation in very similar terms to Steve's characterisation of darkworkers. He picks out the child born into a loveless home environment as being particularly at risk of identifying with this sociopathic orientation.
The whole "light, dark, or NPC" reminds me of
David Shrigley's drawing:
It's art, no, really...