There is a solution, but no one really likes the thought of it, because it involves assuming responsibility for one's own actions, and then working together to undo the damage that has been done--requirements for conflict resolution.
At this point, the United States may or may not be willing to accept responsibility for starting the genocide.
The dictionary definition of a genocide is "ethnic cleansing," and that is what genocides seem to be, but that is a misunderstanding. It is looking at one of the ripples of effects that go out from it instead of the entire devolutionary process that genocides go through.
Genocides come from the power game of Envy--one of the Seven Deadly Sins. It starts as a simple misunderstanding when one person becomes fearful due to a lack of capacity. He or she has a hero in his life, and compares himself to his hero, and he can't compete. This creates a sense of judgment, of black and white. He compares everyone to his hero, and they are always lacking in some way.
The Iraq War started when George W. Bush put his father on a pedestal. When President George H.W. Bush invaded Iraq to defend Kuwait during the Gulf War, it turned Saddam Hussein from an ally--from the Iran Iraq War--to an adversary, and it set the stage for the character defamation campaign against him that devolved into the Iraq Genocide.
To stop a genocide, someone must defend the person who is being defamed. The United States can stand helplessly by and watch the conflict from afar, or defend Saddam Hussein and the fact that because there were no WMD found, it appears that Saddam Hussein was attempting to comply with U.N. sanctions, and therefore it was an illegal war.
The solution is for everyone to agree to the new definition of a genocide, assume responsibility for their own role in the conflict, and everyone meet at Oxford and Stonehenge to end the conflict and then mediation and then in a prototype international court that our organization will work to set up, and finally, all the stakeholder nations will demonstrate the potential of the international government to end and prevent wars at our conference in Europe.
If the United States does not assume responsibility for our role in the genocide, our government will be shutting the door on England and leaving them to deal with the rise of ISIS, and the rest of the planet, because the ripples of effects have gone out from the conflict to draw in every person on the planet.
The preemptive strike went against one of the main principles of the U.S. legal system, that someone is presumed innocent until proven guilty. That is because you cannot defend yourself from prejudice and ulterior motives, which are tools of character defamation campaigns, and deny people the freedoms their governments must uphold, because the judicial system of a nation must defend the innocent when no one else will.