I hope you are right that lack of UN approval will not prevent war.
Notice how illegitimate and dishonest you're already conceding France as being, however. After all it's not as if France is honestly or sincerely trying to evaluate the issue of whether Iraq is in violation of Resolution 1441. It is, and France knows it. They just don't care, because their focus is on trying to prevent us from doing something we want to do with UN approval.
The fact is that UN "approval" should be near-automatic in this case, because Iraq is obviously in violation, and so I reject the idea that for France to "try to prevent us" can be considered any kind of sincere exercise on their part.
Anyway, if we do end up attacking without UN approval, and France doesn't whine shrilly and haughtily lecture us about "violating the international order", then maybe you'll have a point here. Let me know if/when that happens.