In the history of conflict, more soldiers, sailors and especially airmen have been killed by non-combat accidents and illnesses than have been killed by the enemy / threat / bad guys.
Those figures speak really strongly to me about the need to fly in peacetime training the same as you would in war. After all, an aircraft crashes just as well at home as it does in a hostile country. There are some elements of risk which are non-negotiable - if we can/can't accept those risks at home because we will crash, then equally we can/can't accept those risks on ops.
We should fly in war as we have trained in peace, so the only variable factor is the guy with a gun.