A lot of what you said is correct, assuming that 1) all humans have the same goals and 2) all humans are sociopaths.<p>If different humans have different goals, then your argument falls apart; if one of my goals is &quot;do not rape&quot;, then I will feel disgust at the idea of raping someone.<p>And if not all humans are sociopaths, then your claim that sadness serves no purpose falls apart, as sadness enables us to signal to others that something is wrong, and humans whose goals include &quot;help others&quot; will see a chance to accomplish that goal.