What created the Fourth Generation?

Via comment by Sioux on In Ukraine, Shelling and Convoys of Armed Trucks T...

 The Israeli military historian Martin van Creveld has an interesting hypothesis concerning where the seeds of the Fourth Generation's military bypass of the state were planted:

Many of the distinctions between army and people which had been established by eighteenth- and nineteenth-century international law also broke down. Armed violence, far from being limited to combatants, escaped its bounds. Terrible atrocities, including even the planned starvation of tens of millions, were carried out against the inhabitants of occupied countries both in Europe and in Asia.

The populations themselves did not acquiesce with their lot. Occupation per se was now regarded as a monstrous injustice and resisted.

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