No, it is not.
It is that none of us truly know ourselves.
Everyone is a virtuous hero in their own mind, but when in the eye of the storm, many freeze and many commit acts that they themselves cannot explain when the dust has settled.
How often do we hear of family and acquaintances of convicted murderers refusing to believe that their loved one could truly be guilty of such a crime (e.g. OJ Simpson's kids actually believe he is innocent)