From an otherwise good Urban Institute report:
The most vulnerable populations in New Orleans—the elderly, people with physical and mental disabilities, and single mothers out of the labor market—arguably were hit hardest by Katrina.
You don't say? Isn't being hit hardest by massive disasters sort of intrinsic to categorization "most vulnerable?" You see this a lot of Think Tank reports. It's the sort of redundancy-in-service-of-clarity that's apparently taught in grad school, but annoys my inner pedant no end. Yes, the most vulnerable tend to do the worst when services are cut/disasters hit/bad things happen. Being the likeliest to suffer in case of catastrophe is exactly what makes them the "most vulnerable."