Bush's mistake wasn't in going. It was in losing. Failing.
Not a Bush thing, our political machine sets goals and tasks that are too often unrealistic. We can use Saddam Hussein as an example. How easy would it have been to send a team, missile / bomber to his palace? He disappears, but the new guy that takes over isn't who "we" wanted. Who are the "we" in this scenario? You and I, or the political machine that has decided only "they" know what is best for us? Personally, leave the mideast f**ks alone. Let them sort out their own problems. If we have 7 trillion dollars to give away, why don't we give more of it domestically? Too many homeless, underfed and unemployed people right here in all of our neighborhoods, towns and cities.
It is difficult to "win" when you send a military force anywhere but do not allow them to do their "job".