The presence of evil

I just watched "The Boy in the Striped Pajamas" the other night.  It was an exceptional movie that took place in Nazi Germany.  In the movie, an SS soldier and his family were assigned to a home in the country to oversee and improve the performance of a nearby death camp.  The soldiers eight year old son discovered the camp, and not understanding what it was, developed a friendship with an eight year old Jewish boy inside the camp.  They became friends on either side of the barb wire.  The ending is absolutely devastating.
This movie generated some thoughts and questions.  It seems to me that in cases where men gain near absolute authority, they become evil.  And in cases where men acquire huge amounts of money, evil and perversion typically follow.
Consider the Nazi regime, Pol Pot, Stalin, Mao Zedong, etc.  In all of these cases, power brought terrible instances of abuse and destruction. And even on a lesser scale, we see abuses of power in our own government. I don't know where this leads, or what conclusions we can draw from these examples, but we must learn something. 
Maybe we should learn that the limits we have in our own lives, limited money and limited power, are to our advantage.  God is gracious to us, often in ways we don't understand.