Ten years ago this month, on the day Hurricane Katrina struck the Gulf Coast, I was at Camp Casey, an informal encampment outside George W. Bush’s Crawford ranch, listening to a group of veterans talk about their opposition to the wars in Iraq and Afghanistan. By chance, it was also the day my first feature for Harper’s Magazine went to press, an essay about how people react in the wake of major urban disasters. It wasn’t until the following Easter that I went to New Orleans for the first of at least two dozen post-storm visits. The water had…