It's ok to bitch and to complain! But the bottom line is that DHL nor any of its contracting carriers are part of any state sponsored compulsorary service entidies, military or otherwise, which would make anybody fly if they didn't want to. Nobody is ripping the shirt off your back to drag you into a cockpit, it's not an air force.
There is alternative employment: There are beau coup jet jobs out there, especially in the orient; . . . air conditioned, low stress environment with smiling, young, eager beaver cabin dolls. No need to be stuck in a war zone.