I think in a short version, Turd was trying to really hard to mold Nebraska into the modern era of college football/athletics, and everything that entails, while the key players in the state, oppose that. It would seem that the modern era could be considered more liberal in a sense, and obviously those key players are conservative, or atleast enough conservative to keep things from happening. You get to a stalemate with project difficulties looming, no boss to report to, and boom he's gone. Also the whole climbing the ladder in athletics thing.
All the Youtube interviews and podcasts and Jim Rose's tweets point to that, or atleast make me understand it that way.