Yes, humans can be greedy - but the question is whether we design our society to encourage and legitimize that greed in every sphere of life, or whether we maintain non-market norms that check it. The journalistic integrity example proves my/Sandel's point; when ethics became profitable, the market accidentally aligned with civic good. But the concern is precisely about areas where market logic systematically corrupts rather than improves outcomes - ie. where introducing money changes the nature of the good itself (like turning civic duty into a fee, or learning into a transaction). The pendulum swings, yes - which is exactly why we need ongoing public debate about where markets belong, rather than passively accepting their expansion into every domain and hoping the pendulum swings back on its own.