Regardless of the letters, I’m confident a court-martial could be properly conducted.
But the motives behind the letters written while in “captivity” are seemingly dependent on the determined preceding motives that landed Bengdahl in “captivity.” I would think...
Of course, the regime will try to use any balloon that can hold its weight for more than a couple of days.
I totally agree there could be a court martial. The letters, IMO, prove nothing except he was trying to cover his ass and make excuses as to why he deserted.