"In a bizarrely unfair real society arguing that you have the right to maximally leverage whatever value you your dad and your grandpa managed to drag away and coral seems greedy and disingenuous."

You're arguing against aristocracy, not capitalism. In 19th century America (the most free society in history) there was a phrase "from shirtsleeves to shirtsleeves in three generations." In the absence of state-protected income, inherited wealth never lasts long.