Believe it or not, I have issues writing up a good antagonist. I have a bunch of first hand experience being manipulated and lied to but I don't want to use any of it, because it feels like he could claim my success if I did--if that makes any sense at all? (I've been told I'll be able to draw upon it in time and that I'm still healing)
Anyway, seeing people lie, what works, what doesn't and when people allow themselves to be swayed is very helpful getting more of a feel for the bad guys.
I don't think I'd play it myself. I wouldn't know 10 people who could play a game like this and not take it personal. I've seen friendships take some real damage. I also don't feel like playing with randoms.