In reality, the evil of man is the reason the founders gave a limited government. They believed that no one was good and wise enough to exercise too much power over others.
Sometimes it is said that man cannot be trusted with the government of himself. Can he, then, be trusted with the government of others? Or have we found angels in the forms of kings to govern him? Let history answer this question....
A wise and frugal government, which shall restrain men from injuring one another, which shall leave them otherwise free to regulate their own pursuits of industry and improvement, and shall not take from the mouth of labor the bread it has earned. This is the sum of good government.
Thomas Jefferson - First Inaugural Address
"No man has a natural right to commit aggression on the equal rights of another, and this is all from which the laws ought to restrain him." --Thomas Jefferson to Francis Gilmer, 1816.