I understand his position, and it is common knowledge now (no need to rehash the whole "misled the country" thing), but he is a cog in a machine.
After bush is gone, the military will still exist and needs to remain as strong as it can. Civilians and Military are waiting 20 more months to be rid of the worse president ever and his cohorts. But once he is gone and there is new leadership, we can't hand them a broken military. We can't go back to the early 70's, those of us who remember it know how that can affect the country. And with the US rapidly losing power worldwide, it is one of the things that still exterts influence.
The dollar is dead (toast, deceased, defunct), the economy is heading to the shitter (recession fall 07), the consumer is maxed on debt and about to get fucked by inflation (dead dollar & interest rates). One of the last institutions that has been stable is the military. Without that, we all may as well learn Chinese so we can work as call center grunts for the new empire while living in squaller.
With an intact solid military, we can at least keep the peace when all that debt comes piling back on our heads (Guido will want to be paid back, and he is Chinese).
So, even though his concerns are on the mark, he needs to remain part of the "machine". If 30% of the military bailed on the same grounds we would have chaos domestically and would lose all credibility globally on a military level. Thus he must burn.