If you are interested in Sudan, I can't recommend any book higher than 'War in Darfur' its awesome. Very clearly set out, but also very heavyweight in expertise.
Anyway, to chip in on Tale and nick, it sounds like you're talking at cross purposes. If you're pointing a finger of blame then yes it comes to an individual's choice. However, if you want to apportion blame then you're asking a why question. Why did x happen? And that's clearly not all down to an individual. I'd suggest some sort of influence diagram woudl help, if you can be bothered to draw one.