I think people are generally sick and tired of being involved in matters that were either created by us or made worse. Collateral damage is only a small part of the discontent, people are sick of the lies and industrial/commercial/political/military agendas, let alone the still fresh images of repatriated military personnel that have died for the square root of f**k all.
So yeah, many people are generally pissed off with it all. Being taxpayers, also have a right to display their opinion whether you like it or not.