Two words: Stanley Milgram.<p>Our morals aren&#x27;t nearly as absolute as we like to think. 20% of the entire population of Rwanda were hacked to death with farm implements by ordinary people. 25% of the Cambodian population were butchered, starved or worked to death by a poorly-organised militia.<p>Any of us have the capacity to kill if we have a sufficiently compelling justification. Ask any mother if she would kill to save her children. The difference between murder and self defence is mere context - the Nazis believed that they were defending themselves from a Jewish conspiracy, the Interahamwe believed they were liberating themselves from Tutsi oppression.<p>Consider the fact that the rate of domestic homicide in the US is drastically higher in households that own a gun. A great number of Americans have killed their partner simply because the means to do so easily was readily available. Evil or insanity is not a prerequisite for murder, only means, motive and opportunity.