Because a brutal and evil dictator controlled their country for years, horded/stole the country's resources, and lived in numerous palaces like a king (which he was), while various segments of his people lived like cavemen.
Wrong answer.
Like it or not, that's how Iraq was under Hussein. And there's not a damn thing we could have done about it.
President Bush wanted to invade Iraq. For what reason, I don't know.
Congress has never declared war on Iraq.
Bush sought Congressional authority to invade Iraq b/c he conflated Iraq with the attacks of 9/11.
So far, so good.
But Bush couldn't attack Iraq b/c, under the holdings of the Nuremberg Trials, generally you can only use force in self-defense, defense of an ally, or imminent attack.
Iraq did not attack the US. Iraq attacked no one.
That is why Bush asked the UN to permit the US to enforce resolutions dating back to the first Gulf War. Remember the deplorable presentation by Powell w/ Tenet flanking him?
The current resolution governing Iraq's WMD inspections was Res. 1441 which clearly stated that if WMDs are discovered during inspections, the UN Security Council will convene to authorize a use of force.
The WMD inspectors were turning up nothing. Bush saw his only legal course for attacking Iraq go up in smoke. So he ordered the attack before the inspectors could finish their jobs.
That order was in violation of Res. 1441 and thus illegal.
Like some mafia hood, the US rolled into Iraq, capped the owner, and set up shop most advantageous to itself.
Or I could be wrong. But I'm not.