Why did social darwinism make sense to the millionaires created after the civil war?

Social Darwinism provided a justification for their wealth and success by suggesting that they were inherently superior to others. It also promoted the idea that wealth and power were the result of natural selection and survival of the fittest, thus legitimizing their position in society. This belief system allowed millionaires to avoid feelings of guilt or responsibility for the economic inequality and social injustices of the time.