I really like the article but I feel like ignoring incentives always costs something. Only people who can afford the cost get to look principled, which turns having money into looking like having character. Everyone he praises in the article has/had a safety net: Sumner was a Harvard-educated senator with inherited standing, the writer himself still had a career after dropping his uni title.

The fish metaphor has the same issue. The people dying on the sidewalk outside his conference have seen worse than he has, they don't lack moral clarity but rather the freedom and capital to rebuild their lives around it. His essay treats seeing the fish and acting on it as a single moment when the acting part requires you to have capital/social safety net.

I usually go around saying to anyone who will listen "incentives are dangerous". Like... you can't avoid them as people are sneaky bastards and will find what the incentives are even if you didn't design any on purpose, but you should be on the lookout always and be damn careful if you ever get the bad idea to introduce any.