People are disgusting. Of all things to "unite" people... waging this sort of war on one's own people? Not that I think we should swoop in and rescue anyone, clearly that sort of society is fucked and needs to just exterminate itself.
But it won't. Quite the opposite, they claim removing this type of people will keep their society going because they have eliminated a biological deadend. And it's only 1% of the population they would be exterminating, certainly not a deal breaker for their society.