Then-PFC, now-SGT Bergdahl may in fact have deserted his post. There are certainly credible accusations to that effect, and if so, then he should be tried and convicted for the crime. But it's a whole lot easier to investigate those charges with him here, and we don't let the Taliban mete out justice for us.
The military idea of "taking care of your own" has a lot of different aspects. Holding the line and leaving no one behind are obvious; less obvious, perhaps, is that our people are ours. Loon or no, deserter or no, even traitor or no, whatever else Bowe Bergdahl may be he is someone who raised his right hand and took the oath, and that means that whatever reward or punishment he receives is ours and ours alone to give.
It astonishes me sometimes, having at this point been out of the service several more years than I was in it, how strong and pure those ideas still are in my head: how much "us" the profession of arms still is to me, and I suppose always will be. I'm a civilian and happy to be one now, but both the infantryman and the medic are still very close to the surface. The latter is concerned mainly with bringing back the wounded--and the former is ready, willing, and perhaps even eager to kill anyone who stands in the way of that mission.
Whatever else we did, whatever else we may do, we had to bring him home.