If by fouled up, you mean completely successful, you would be correct.
If Bush had "done what was necessary" there would have been no need for a "surge" in 2007.
Circumstances called for more troops, which he committed. That is the definition of doing what's necessary.
There's no need to make excuses for incompetence or malfeasance.
There's no need to replace your personal -- and completely nonsensical -- version of history with what actually happened. There is no parallel between Bush and Johnson. None. Anyone who sees one is a fool.
bkmk