Q&A: Which philosopher, Mencius or Hsun-tzu, is correct about human nature?

Due to the fact that both Mencius's and Hsun-tzu's ideas appear to be mutually exclusive, logic would dictate that only one viewpoint can be correct.  I think that Mencius’s view of human nature is ignorant of many of the facts that surrounded him.  For one, Mencius lived during the Warring States Period, a time of near constant warfare that had already lasted for a hundred years by the time of his writings. That doesn’t discredit his ideas but it seems odd how he would theorize that humans are naturally virtuous during a time of great strife and violence.  But there are times that people do not act spontaneously to help others in need.  A 78-year old man was struck by a car in 2008 in Hartford, Conn.  No one, pedestrians nor drivers, on this busy street helped him.  In fact, some people walked up to him to get a closer check at the man but didn’t help him up.  It wasn’t until police, who were responding to another call, drove by him was an ambulance called.  The police chief even said: "we no longer have a moral compass."  In effect, humans are more closely akin to Hsun-tzu’s view of human nature of selfish, self-concerned beings.