Um... I've only seen the movie, I haven't read Countdown... But I thought his motivation was explained just fine in the movie alone... lol... I mean, he had to watch his wife, family, friends, everyone he knew, the place he grew up, his whole life outside of mining, completely destroyed. That's gotta be pretty traumatic. I could see it being enough to push the wrong guy off his rocker and into some nasty decisions. I thought that came across pretty clear in the movie.