So he felt more compassion for the Afghan victims of US terror. Great, that makes him human. Maybe he's a conscientious objector, maybe he's an idiot. I don't really care. The fact that he was able to view victims of US terror with compassion sets him apart from his accomplices in Afghanistan.
If he felt compassion for the victims of US terror, then there were a large number of legal options for him to quit his job. Instead, he is suspected of going AWOL, and thereby causing the death of multiple soldiers.
The fact that he got others killed is a real problem for him. There will be a clamor for involuntary manslaughter charges as his negligence did in fact cause the death of others. If it can be proven that he was in any way involved with the killings he will face the death penalty. I hope this was just a case of a disillusioned soldier that made a bad choice. Either way this is all a hell of a propaganda coupe for the Taliban.