So, we're back to "It's all Bush's fault, huh?"
Oh, I doubt that those retaining walls were constructed under the Bush administration, although I don't know for sure.
But facts are facts. Either the floodwalls failed, or they didn't (they did).
And either they were properly constructed, or they weren't.
As the Gipper famously said, "facts are stupid things."
Not considering that those levees were mostly complete, and all were contracted for, before Bush ever became President.