You shouldn't be afraid of the Gates and Buffetts of the world. These guys have found their place, they know their value and their worth and they know how to create wealth for themselves and for others. They are secure, confident, valuable human beings.
You should be FAR more afraid of all the incompetent "big shot" politicians who somehow have access to power but, due to their insecurity and low IQ, only use it to benefit by taking from others. These are the plutocrats that rule America, Russia, Europe, regardless of your illusion of democracy. These are the people you should be worried about.