How many people actually believe the US military doesn't commit war crimes or acts of terrorism?

If so, was the pilot of IranAir 655 to blame for the deaths of his pengers? Was the 14 Iraqi girl d and murdered (along with her family) by US soldiers in the Mahmudiyah macre asking for it? Were the 500 or so (nobody knows for sure) Vietnamese women & kids & old people in Mai Lai all Vietcong as well? These are just a couple of examples; there have been numerous atrocities and acts of terrorism committed by the US military, yet all I ever hear about such incidents are excuses from people unable to accept that they happened.