I think that the disabled, the helpless, they are not useless. They do have a purpose.
Unlike the Nazis who considered the handicapped and disabled as ones who needed to be disposed of because they are a burden to a country's resources, they serve a purpose that money cannot buy.
They show our humanity.
By caring for them, we show that economic production, power, and pleasure are far lesser goals than the one that fills our souls. The need to love.