Again, it's not illegal, and he's not dictator of the U.N. It's a coalition of multiple countries, and they have to decide, as a group, if it's illegal or not. One man's opinion is irrelevant. No more than if the president said that he felt letting people have healthcare is wrong, or what have you.
Furthermore, he was committing atrocities against his people up to and leading to the invasion. Other than killing at least 500,000 people [
1][
2][
3], he committed numerous human rights abuses, including torturing people in the hundreds of thousands, repressing journalists, U.N. inspectors and numerous citizens based on nothing more than ethnicity or geological location, and other heinous acts. Considering the Halajba poison gas attacks for a moment, which were tragic, they killed between 10,000 and 40,000 people, maximum. His numerous other attacks, his other genocides, killed hundreds of thousands, not 10's of thousands. He produced millions of refugees and internally displaced people, and then stole the humanitarian aid, which meant without boots on the ground, these millions of innocent people likely would have flat out starved to death. His atrocities did not simply stop after 1988, 1991, or 1994. They continued well on until we deposed of him. In 2002, a resolution sponsored by the European Union was adopted by the Commission for Human Rights, which stated that there had been no improvement in the human rights crisis in Iraq. The statement condemned President Saddam Hussein's government for its "systematic, widespread and extremely grave violations of human rights and international humanitarian law". The resolution demanded that Iraq immediately put an end to its "summary and arbitrary executions... and the use of rape as a political tool and all enforced and involuntary disappearances". He didn't just gas the kurds, with conventional weapons alone the violent repression of the Kurdish, both those opposed to his regime and those supportive, continued. [
1]
If you want to speculate whether or not we are good or not, that's an entirely different conversation in and of itself; again, you can personally hold the opinion that the U.S. only got involved for specific reasons. But it did have alternative stated reasons, which would be justifiable, and thus would have justified the invasion.
Furthermore, it is not a violation of international law to go to war with a country that has not directly attacked you. Time and time again, the U.N. has acted in an official capacity to go to war against countries. [
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2] To name a few, the Korean war, Gulf 1, the Democratic Republic of the Congo, Kosovo etc. So the idea that force is never justified unless personally attacked, is more or less obviously wrong. The U.N. charter also mentions the
use of "collective self-defence", which implies that you can defend someone else, not just yourself. If say, France was attacked, the United Nation's could join in to defend France, or the U.S., or Britain etc. You don't just have to defend yourself. You're
allowed to help others.
The U.S., by the way,
did get involved in the Rwandan genocide. The problem was that the worst problems occurred in about 3 months, between April 7th and July 15th, or exactly 101 days, the time it took to get approval to act. If we had acted earlier, it probably would have been better, but that's life for you. Although they shut them down quickly, it didn't really matter, since they killed nearly 2 million people in 3 months.
No-one "allows" a conflict to continue, actually fighting in a conflict is a very difficult thing to do. By that argument, all of Europe "allowed" it to continue, as did China, as did Brazil, since, they didn't get involved. You can't attack just the U.S. for not getting involved, or not successfully stopping an attack, especially considering the difficulty of engaging in a conflict given international law. However, the U.S. was involved in the
Darfur conflict. A hell of a lot more than any other U.N. country, with only two more, Chad and Eritrea providing any assistance. We were stretched thin by two key conflicts, and several other at the same time, so the military response wasn't as great.
If you want to sit here and tell me that you condemn the U.S. for not controlling the entire world, and stopping every single conflict that exists, solving every crime, that's fine. It took us years to get involved with the Iraq war, it took months to step in and help stop the Rwandan genocide. How evil are we for waiting to wage war?
But you can't ignore the fact that they did have a good reason to act, which was the defense of the local people. If you want to claim that they had alternative motives, that's great, but that doesn't change the fact it would still be in defense of the people. Hell, maybe Mother Teresa just did it for the publicity, or maybe the Iraq War was about getting potatoes, all in secret. Anyone can project on to someone and say that they must have done it for evil reasons "he only donated to
Charity because he wants to feel self-righteous!". Why didn't you donate to every Charity in existence, huh, Jack-ass? You think Cancer is the only problem in the world?! But even if it was secretly motivated by other means, it was justified, and the only thing you have to disprove it is conjecture and vague opinions.