First of all, I would like to see some proof of your numbers. If true, and I am not saying they're not, then you have to admit that our sanctions in the Clinton years killed 50% of the Iraqis that Sadaam did.
Because Saddam kept such a tight lid on his reign, exact numbers are hard to come by. Yahoo, UK, UN, and DOD figures vary. Estimates of etnic Kurds that were killed are between 100k and 300K, not including another 100k-150k kurds that "disappeared". Shia dissident are estimated to be as low as 150k and as high as 400k. That doesn't necessarily include the work of his sons, whose reports of rounding up prisoners (political prisoners,law violators, two bit rabble rousers, etc), plus their families, tally in the hundreds of thousands over the years. Low estimates of people who disappeared could be as low as several hundred thousand, but could also be as high as several million. To your question of sanctions, putting reponsibility on the sanctionee is like Adam trying to blame God for giving him the woman.
I would like to see some legal protocol on how we decide which dictators we depose, and which ones we decide to leave in power. Why leave Kim Jong Ill, or Idi Amin, or even Fidel Castro in power ?
The simple fact is, we can't solve everyone's problems everywhere, every time. Had we gone into Germany long before 1941, a lot more lives might have been saved. That doesn't in any way mean entering the war when we did was a bad thing. War is what war is. If it were easy, it wouldn't be war. It's always bad, but it's often a right thing to do.