That's a somewhat naive view. It presupposes that the current system is just, because (1) all members of society had an equal hand in shaping the current system, (2) that it was designed to serve the interests of society as a whole (rather than those who benefit most from it), and (3) that it would be easy to change the system if a consensus emerged among a majority (or even a vast majority) of society that such change was desirable. I disagree with all three presuppositions.