Things dont happen so fast. It will take a while until the suffering reaches a point where most men would rather die fighting then endure one more day of this madness.
Take for example the social wars of ancient rome. The city state that would conquer an empire was defeated by its own subjects and forced to give into their demands.
Even though the romans conquered all of these tribes, killed their men, raped their wifes and enslaved their children they still were defeated by them.
Or the french revolution were french soldiers would start to change sides to the rebels because they didn't wanted to shoot their own people? They took almost all of the nobility as captives and killed almost all of them.