Why would I not be serious? You must have been exploring Antarctica for the past decade to have missed the invasion and occupation of Iraq. Any aid given to Africa to fight diseases and the global HIV/aids pandemic is drowned in the blood of hundreds of thousands of Iraqis killed and wounded in bush's Iraq war. Do you have anything to say about the killing and maiming of hundreds of thousands of Iraqis or is it ok because they're just Arabs/Muslims/Iraqis and there blood is cheap compared to westerners?
At the time of the invasion of Iraq, that country was ruled by an increasingly unstable dictator who had proved his mettle by invading a neighbour and having to be forced out of that country, while boasting about his stock of weapons of mass destruction and threatening what he might do with them.
As it turned out, he was a fantasist in relation to the weapons, but his regime terrorised his own people, having killed many of them, and threatened its neighbours, as we've seen with Kuwait and Iran.
Many of his own people, not to mention his neighbours, wanted him out, and are very glad to this day to have got rid of him.
Unfortunately sectarian divisions continue to dog Iraq, and there are still far too many deaths there from suicide bombings.
The Americans probably didn't understand how they were lifting the lid off a powder keg, and there's no doubt that there were massive failings in how they handled the whole process.
But to call the overthrow of Saddam Hussein a war crime is almost to pervert the meaning of the term, in my view.
And your last sentence just makes you look silly.