Better yet, this strategy works only against a repressive regime. If the people support the regime, it's much harder to separate the two. The nation's soldiers are more likely to fight, and the people are more likely to help them. Moral error produces military failure, forcing the politicians of the attacking country to worry as much about the former as about the latter.
The theory has one flaw. Just because we have the ability to spare people's lives doesn't mean we have the will. Our military is so powerful that our generals could massacre the Iraqis if they wanted to. That's where restraining institutions are needed.
If you're an anti-war protester or politician, this theory of warfare should change the way you think and act. Your efforts to generate resistance to the war before there is any evidence of killing, much less atrocities, contribute to the political strength of the enemy regime. You encourage uncertainty about the war's outcome, increasing the likelihood that the regime's soldiers will fight and die. You make it more difficult to separate the regime from its people. You frustrate the tipping and bring on the crushing.
If you want to minimize the killing, stop resisting the war. Instead, do what you can to make the war transparent and to hold your government accountable for unnecessary deaths. Help the media and human rights organizations monitor the battlefield. Help them get reports and pictures to the people of your country and the world. Build an incentive system that will strengthen your government's will to spare lives. Its ability will do the rest.