You cant plan for something like this. The city is 8 ft below sealevel. Nothing man made can stop mother nature.
They knew this was coming for years. And they accepted planning that left 100,000 people behind. Now instead of driving them out on roads on Sunday, they have to get them out through water if they don't hurry.
In any disaster there will always be those who are dumb, uneducated, crazy, drug addicted, looters, etc...that wont do the smart thing. Now they are paying the price. Its not the citys fault that those people didnt get out.
You can't stop the storm. But you can have a plan in place to get everyone out who wants to get out. That wasn't done. And it borders on criminal negligence.