Yes, the lower 9 is safe to drive through. You really won't be able to get an true idea of the devastation but, you'll still be able to see a bunch of empty space where buildings once stood, some abandoned houses, and Brad Pitt's "Make It Right" houses.
One of the things that you should take away is that "where there is a will, there is a way". The government was a big help, but it is really up to the individuals.
Thanks for coming to visit us and all the best to the people in your area.