Why did the founding fathers fear the common people?

You got this all wrong, the Founding Fathers feared the Government, because they knew that the government cannot control the economy, without controlling the people. Therefore they made the Bill of Rights, to protect the individual rights of citizens. But even this didn't stop the Government. Just look at Executive Order 1066, Japanese American's rights were taken away within a heart beat. The Founding Fathers did not fear the people, but the Government.