"That last sentence is ludicrous on its face. How is help going to get there if the people delivering the help don't have the foggiest clue as to where it needs to go?"
The point was that lacking a plan, people would have been better off moved to safe dry land. Would it not be possible for a bus full of people to contact authorities and let them know where they are at? Most likely in that case, it would be a convoy of buses anyway, highly noticable to the authorities. Just because the Superdome is easy to locate doesn't make it a better alternative to evacuating at all. That has been proven.
Let's take a look at how long it took the authorities to get up to the mob of refugees on I-10 right next to the Superdome. Despite the fact that it was right next to an official "refuge of last resort" site, despite the fact that Fox got their cameras there early, and despite the fact that (unlike the Superdome), ANY type of vehicle could have gotten there at any point after the hurricane went through, how long did it take the supplies to get up there?