Extreme Social Darwinism (E.S.D.) is the idea that we need to eliminate the inferiors in our gene pool to an extreme. If only the fittest survive, then we need to make sure that the only people that are alive, are the fittest.
Rather than let nature do this, E.S.D. thinks that mankind should weed out the inferiors itself. Countless people could die, and this idea is considered by many to be horrindous, yet by one person, a very good idea (Diego, by the way, not me).
Diego applied Extreme Social Darwinism to the world only to learn he wasn't one of the fittest.