The big population centers are Palm Beach, Broward, and Miami-Dade, with a combined population of several million--at least 5 million, I think. They weren't expecting a big storm, and because they are much more populous than Martin and St. Lucie (which were hit relatively lightly, and at the northern end of the stack) a big evacuation would have faced the same challenges Houston faced before Hurricane Rita.
I think we need to take a close look at what southeast Florida was told to expect in the days before Wilma hit, because I don't remember anyone focusing on Ft. Lauderdale, of all places, being worst hit. Not with the storm making landfall on the Gulf Coast and predicted as a Category 2.
I do not recall Ft. Lauderdale and Miami getting warnings to get the hell out of Dodge because this was going to get bad. I think that before the blame gets out of hand, people should look and see if that was the message, or not.
I think you're missing the point. The whiners were complaining about ice and water, and other things. They weren't complaining about not being told to evacuate.
So, if they'd been prepared, they wouldn't need ice or water THE DAY AFTER the hurricane. They ignored the warnings to prepare and then they have the gall to complain that the gov't is not supplying them with what they should have supplied for themselves.