I disagree.
These same people were against US entry into WWII, until Pearl Harbor.
The reason we call WWII a big win now, is because of hindsight. The US people were against us getting into that war. And if they had had real-time news telling them about every single mistake, every lost battle . . . we wouldn't have finished WWII either.
You're probably right in your conclusion. My point is simply to indicate the MSM's monkeywrench tactic now, although I'm sure you're right about what it would have been then. The results would have been equally disasterous.
But, hypotheticals aside, WWII fails to persuade liberals for the reasons I stated. It's accepted to be a large fortune spent on a very large result. Iraq is accepted to be a small fortune flushed down the toliet. That's their story, and they're stickin' to it. It's effective, too.