Yeah but US + Allies have still lost in Iraq too. They won the war sure but now they have a situation where every civilian is a potential hostile combatant.

My point is that the oppressed population who "lost" (Iraqis, Afghanistanis etc in these examples) aren't just like "oh well - I guess I'll just abandon everything I know and believe in and start eating beef and alcohol since the US invasion wiped out my country's military.". Instead they are resisting and so now you get the quagmire where basically anyone old enough to stand is now a threat to the occupiers even if they "wiped out" the army.

So you're not going to have some hypothetical "robot war" where no humans are hurt. The humans will start getting hurt once all the robots are dead.