"1. If buses were available it would not have been hard to get someone to drive them."
A plan could not have just anyone drive them. Insurance issues, etc.
"2. Where would they go? Higher ground ! Do not think it would have been hard to spot a group of buses."
They needed a plan with military bases, Astrodome, etc...and this would have been activated twice before, earlier evacuations. People wouldn't go for it.
Perfection is impossible. The real fault, IMO, is getting the busses late into the Superdome. If 80% evacuated, I think that's a darn good result. Try evacuating 80% of New York. Or just Manhattan.
You should have been at the Emergency planning meetings with Nagin and company. You could have asked those questions months and years earlier. Now is not the time to ask "Who could have driven those buses?"