If you ask people about why such things as racism, sexism, etc. are bad, the answers are many and varied. “It’s not right to treat someone different based on the way they are” seems to be a popular go-to. But most people don’t think of it at the base level – practically and pragmatically.
The truth of the matter is that the “isms” hurt us simply because they hamper evolution. Not just on a social level, preventing the flourishing of new ideas and combinations of thoughts, but also on the level of physical evolution. Plain and simple, the biological progress of man via evolution comes from the mixing of the strongest genes to create a bigger and better
Those who hold on to the old views that some sort of racial or social purity is the key to a strong society and a unified people are reasoning with outdated, false knowledge. Science has shown that insular genetic communities have more problems than diversified ones. The same can be said of social and religious beliefs and even gender-orientation. To suppress a type of thought means to discount the potential for greatness that it could generate on account of its very strength –uniqueness.