It is true that some individuals are born into wealth, or born with a favored skin color, or born with an above average intelligence. Such aspects of a person, however, were not chosen by the individual. To claim otherwise is to claim a belief in unicorns, i.e., a supernatural world where you can choose your parents before birth. To say that a rich kid should (morally or legally) give up a portion of his wealth to those who were born into poverty is just as preposterous as saying a genius should give up a portion of his intelligence to an idiot. Such a stance is a complete negation of ethics, of morality; it is a secularized version of original sin. Ethics, morality, must pertain to individual, voluntary choices and actions; not actions taken at the point of a gun nor to unchosen aspects of an individual at birth.
Being born into poverty, an unfavored skin color, or a lack of intelligence are not chosen either, and individuals should not be damned for it. If an individual is willing to work for $3 an hour, and another is willing to hire him for $3 an hour, but would go bankrupt if he had to pay the government mandated minimum wage, who wins and who loses? The prospective worker loses the opportunity to earn a wage, however meager, and the prospective employer has to do that job himself (when he could be doing more productive work) or leave that job undone.
Life is a process of self-sustaining, self-generated action. To live, as a human, that means the use of our faculty of reason in pursuit of values. Criminals and thugs choose to live at the sub-human level of animals, using force to get what they need to survive. Career welfare recipients choose to live at a sub-animal level, attempting to live as plants do, rooted in place, gaining values (food, water, sunlight) automatically. Both categories fail to realize it is only the rationally productive people, the humans who choose to live AS humans, that make it possible for them to live.
I recently heard a news story of a man who cut off his own foot with a circular saw, and then burned his foot in the oven so the doctors would be unable to reattach it. Why did he go to such extremes? To continue getting unemployment benefits, because he really didn't want to go back to work. From each according to his ability, to each according to his needs. In my view, socialism doesn't have a foot to stand on.