Facts: No ISIS before US invasion, ISIS after US invasion.
Opinion supported by sound logic: Saddam would have abso-fucking-lutely killed ISIS when it was still a fetus (abortion!)
Opinion of total speculation: Obama's premature withdrawal from Iraq led to ISIS. Even this is true, it still supports that conclusion that US invasion led to ISIS. You like this opinion better because you can blame a liberal president, not a conservative president for the mess.

You must be an avid conservative talk show listener, having nothing better to do than attacking liberals.