Hell, farms and water sources could be used by the military to sustain soldiers. Women of childbearing age could produce future soldiers. This line of reasoning has no floor.

There’s a reason that past generations tried to draw a line in the sand and say “we will not cross this line.” It was imperfect and often violated, but at least it served to frame actions as just or unjust. Blatant violations could catalyze domestic opposition to unjust war, as in Vietnam and Iraq. Now that the standard has been eroded into nothing, I don’t know if we can stop further escalation.