Commenter notsaying observes:
We [Americans] are still strikingly unable to process the thought that changing facts on the ground re immigration may require a change in our laws and regulations — as well as our expectations and attitudes. The ideas that many American have that because we used to take in lots of people we must always do so and that because illegal immigration is bad that therefore all legal immigration is good are very strong.
It would be hugely beneficial if Americans realized they could change their minds about policies going forward without admitting they were wrong in the past. We’d have better policies in the future if pundits could come out and say, I was in favor of X in the past and I was right, but now conditions have changed, so I no longer favor X.
In particular, we’d be better off with more Declare-Victory-and-Go-Home decisions. Vastly increasing immigration has done wonders for availability of ethnic food, but the marginal returns on that have been diminishing steadily. Why not declare victory and go home?