There is nothing in the Constitution about social welfare programs to provide equality of opportunity. It's all about the "general welfare", which had a distinctly non-redistribitive definition in the 18th century.

> it was never meant they should provide for that welfare but by the exercise of the enumerated powers, so it could not have been meant they should raise money for purposes which the enumeration did not place under their action; consequently, that the specification of powers is a limitation of the purposes for which they may raise money.

- Thomas Jefferson