The enormous disconnect between reality and the decision-making process did it for me. I was simply fed up at being angry every day, and also concerned about the impact that cost-cutting would have on the meagre family life we were allowed to enjoy.
That, and an illegal war, pushed me to fill in the PVR form. Although I didn't mention the war as my unit had guys (and girls) out there at the time...except when very drunk, and the unfolding soapbox could be brought out in the Mess!