Not to be a liberal apologist but the underlying pricinple is that it’s not just hard work, but intrinsic capability that determines success. In essence God hands out different quality brains with different capabilities. You ended up with a better-than-average brain, and thus better-than-average earning potential. The kicker is that you didn’t do anything to earn it–you couldn’t possibly have, unless you believe in reincarnation. So, as a society, those who undeservedly ended up with good brains are obligated to help those who undeservedly ended up without good brains.