The Taliban killed approximately zero Iraqis (you may be confusing al-Qaeda with the Taliban, and the group that after the war temporarily adopted the name “al-Qaeda in Iraq”, before becoming the Islamic State—that erupted into a major force because of the American mismanagement of the post-invasion occupation, most notably the almost entirely unmanaged demobilization of the security services—with al-Qaeda itself. Americans killed a lot themselves, as well as launching an unprovoked war of aggression which produced the context in which many others were killed beyond those Americans killed directly. But all of those deaths are America's fault and responsibility, even those that are also someone else’s fault and responsibility.