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I'm not a fan of the UN either, but if Iraq or any other country breaks the UN resolutions then it is up to the UN to make the decision on how to handle it. The US can't just invade a country and the argue that the broke UN resolutions. It is not the US's place to make unilateral decisions on behalf of the UN.
Also, if you look at the history of the US in the Middle East, everything that the US touches seems to turn to shit. We have over thrown democracies, installed viscous dictators, and installed military bases all over the place. It seems that every action the US takes comes back and bites us in the ass about a decade later. Iranian Revolution, backing Osama Bin Laden and Al-Qeada, putting Sadam Hussein in power, and funding and arming the Taliban. All of this was done to try and install a more American friendly presence in the Middle East, and all of it has backfired for US and caused millions of civilian and military deaths in the region. It's really easy to argue that the US is the number de-stabalizing influence in the region.
So yes, the UN wasn't really formed as a world police. It was formed as a step to bringing the world together, hopefully towards peace. It was formed to help enforce treaties. I was formed to provide humanitarian aide. And most importantly, it was formed to prevent another World War. It tries to resolve conflicts without violence, usually through trade sanctions.
The US has taken huge steps to destroy the legitimacy of the UN by ignoring the same resolutions and sanctions that the UN issues. Additionally, the US continues to support Israel which has broken and violated nearly all of the 65 resolutions against it. And with the US backing Israel, Israel is free to continue to break those resolutions and pursue their aggressive expansionism into Palestine. You would think that since the US holds one of the 5 permanent spots on the security council it would be a little more concerned with image of the UN instead of just ignoring it whenever it pleases.
I'm not saying this to justify Iraq's violations of UN resolutions, but to illustrate that those violations had almost nothing to do with the actually reason for the invasion.