Guilt by association guys. The lumping of US soldiers and US Army when discussing these acts is very reckless. For every 1 bad one there's tens of thousands of very honorable men and women. That's the cause of the image degradation, not the acts but the hasty generalization that takes place becuase of those acts.
Most incidents that occur involve more than one individual... And having lots of reported incidents all involving groups of people indicates that there is something wrong at the very core of the US armies training, recruitment or management.