New Gallup poll numbers show Americans increasingly dispute the idea that government has a responsibility to make sure everybody can get health insurance. It's tempting to see that as an indictment against Obamacare, but it might just mean more Americans are becoming jerks.

The number of Americans who think health care is the government's responsibility hovered around two-thirds for the first half of the 2000s, peaking at 69 percent in 2006. Then those numbers started falling, hitting 50 percent in 2010 and 42 percent this year. The shrinkage of American generosity during that period wasn't just about health care. The onset of the recession corresponded with a change in public opinion on a range of issues, and in most cases the effect was to make Americans less caring about others.

Starting in 2007, the portion of Americans who said the government should guarantee every person enough to eat and a place to sleep started falling, from 69 percent to 59 percent last year. People who said the government should help the needy, even if it means going deeper into debt, fell from 54 percent to 43 percent over the same period.