They might just do it. From Larry Johnson at unz.com:

The U.S. and Europe — the Brits in particular — are out of control and flouting international law as they carry out military strikes in Yemen, Syria and Iraq. The West claims it is an act of self-defense, but instead of killing or arresting specific individuals responsible for attacks, are engaged in collective punishment. I think we are coming to a point where anger against the West is going to boil over and the U.S. and Europe will get a taste of their own medicine. All of this was avoidable, but the U.S. and Britain have convinced their citizens that attacks on foreign countries without the backing of the UN is entirely appropriate. It is not. These actions shred international support for the U.S. proclaimed “rules-based international order.”
The latest incident to spark outrage is a hellfire missile strike in Baghdad.
According to CENTCOM, Abu al-Saadi was the only target of the assassination in Baghdad. Acording to them, he was responsible for attacks against American bases.
According to a pro-resistance source close to the PMU, al-Saadi was assassinated alone in a car without any other companions being assassinated, contrary to the initial reports of a second person.
[Other] Reports state that the targeted assassination hit the vehicles of Kataib Hezbollah commanders, namely Abu Baqir al-Saadi and Hajj Arkan al-Alaywi.
The United States ostensibly has friendly relations with the Government of Iraq. The normal procedure under the “rules-based international order” requires the United States to issue an indictment against the alleged perpetrators of Tower 22 bombing and then present that to the Government of Iraq and request arrest and extradition. Rather than follow a diplomatic route, the United States carried out an act of war on the sovereign territory of Iraq. This act gives Iraq — again under the “rules-based international order” proclaimed as sacrosanct by the United States — the right to strike back against U.S. targets.
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“The real power in America is held by a fast-emerging new Oligarchy of pimps and preachers who see no need for Democracy or fairness or even trees, except maybe the ones in their own yards, and they don’t mind admitting it. They worship money and power and death. Their ideal solution to all the nation’s problems would be another 100 Year War.” ~ Hunter S. Thompson