Hurricane Katrina

There's been a lot of criticism on the Bush government's response to Hurricane Katrina. For example, "people didn't leave because they didn't have cars". However, I just don't think the government is alone to blame here.
In Asia, if people relied on the government to save them, well, that's as reliable as waiting for God. A Muslim school teacher used to tell me that the Prophet Muhammad said: "Have faith in God, but you should still tie-down your cow to the fence post".
Of the disabled people who were left behind, I want to know what their neighbours did. Did they just leave these people behind to die?