Iraq and Weapons of Mass Destruction
I guess one could argue those trillions could have been used elsewhere but given this admin, I don't think so.
As for trillions spent on the war? I don't think it was multiple trillions. It certainly didn't cause the huge bank default in '08. The 7 trillion that 0bama glommed onto for Stimulus I, II and III and other domestic spending didn't go for war funding.
I don't even know what "evidence based medicine" means but I couldn't read past the poor analogies so maybe he explained that later in the article.