It appears that all except for the last three Culture novels were written prior to 2001. It's not as if there wasn't pro-interventionism from the liberal side,

It appears that all except for the last three Culture novels were written prior to 2001. It's not as if there wasn't pro-interventionism from the liberal side, under the elder Bush and Clinton administrations the U.S. became "the World's Policeman" after the Cold War, but within a multilateral aegis (U.N.-authorized interventions in Iraq, Somalia, NATO missions in the Balkans, etc.). The second invasion of Iraq was a drastic sea change. Many of America's traditional allies (France, Germany) rejected it. China and Russia condemned it. The U.N. was not behind it. It was preemptive and extrajudicial.