These analogies are forced to fit your narrative. By your logic we should never do anything because future generations may realize we were wrong. Colonialists

These analogies are forced to fit your narrative. By your logic we should never do anything because future generations may realize we were wrong. Colonialists didn't care about helping natives, they wanted their resources. Whether or not eugenics could work was never in question. It was whether it was moral. The holocaust was motivated primarily by hatred, not merely misguided attempts at improving the world.