Sometime, somewhere in your career, you will find yourself a leader in political hell. In all likelihood, you won't see it coming. It will be more than a simple, transparent office vendetta or confrontation. Everyone is tempted to find a scapegoat.
Budgets are very tight.
Line business units fiercely protect their turf. The company either never had a CIO or it hasn't learned to value one as part of the team. By the way, this is a true story. And it gets worse. An outside consultant recommends strengthening the CIO function.