The paradox of power

I recently read an article in the Wall Street Journal entitled "The Power Trip". Here what it has to say about people in power:

1. According to the article, people give authority to people whom they genuinely like. In other words, people who climb up to a powerful position are those nice people.
   
   
2. However, once they rise to the top, they change. "When you give people power, they basically start acting like fools. They flirt inappropriately, tease in a hostile fashion, and become totally impulsive." said Professor Keltner.
   
   
3. Why does power lead people engage in unethical behaviors (think Bill Clinton with Monica Lewinsky or Blogojevich's bribe case or Mark Hurd's expense account fudging here)? Psychologists argued that one of the main problems with authority is that "it makes us less sympathetic to the concerns and emotion of others."