Some people actually believe this logic. They just are referring to different "undesirables"
She pointed out that all the family members of the “undesirables” killed by Hitler were then able to contribute to the war effort rather than take care of their burdensome family members. “It’s not a disconnected fact that once the mass murder of people who were dragging down otherwise productive contributors to the economy was legalized, trillions were added to the German war machine.”