Legacy treatment IS preferential, but private institutions that depend on funding by alumni are not "invidiously" discriminatory when they give such preference.  Harvard taking in Bush on account of "legacy" is not like Harvard denying Obama admission on the basis of his skin color.  The former has at least some rationality to it; the latter, none.

As for equality of access to lawyers:  You really think Jesus insisted that society provide the poor man with as good a lawyer as money can buy?  What planet are you on?