I agree no plan is going to get everyone out in an hour or a day. However, everything they try to help seems to be reactive, little anticipated.
If you have an evacuation, you will need to switch all/most lanes outbound. That was not anticipated.
Gridlock on the major highways is horribly inefficient. You want a steady rate of speed. They needed to control the number of vehicles getting on the highways. That was not anticipated. Well, they probably knew gridlock would happen; they didn't do anything about it.
Basically, we have a lot of blather about homeland security and keeping us safe, but when it comes to actual events, a lot of things suck. Fortunately, in this case, it was just a major pain in the butt because of the warning well in advance, but if a terrorist attack required a orderly, efficient evacuation, we are screwed.
The kind of at ude that says you can't expect or do any better is plain old defeatism. We can and ought to do better if we really take terrorism seriously. If we are not going to take it seriously, I guess that at ude is ok.