"Show me that age and country where the rights and liberties of the people were placed on the sole chance of their rulers being good men, without a consequent loss liberty." Patrick Henry (1788).
James Madison put it another way - if men were angels, there would be no need for government - but since men are not angels, they need a government - but who is to watch the government? We must.
The simple reality is that human history clearly bears out that, as Lord Acton stated, power corrupts, and absolute power corrupts absolutely. That is why we have a government of laws - established under a written Constitution - with certain protections for everyone - including tremendous checks on the power of the government. Still, that is not enough. The people must always guard their liberties, or the protections in the Constitution will be meaningless. Americans, stay on guard - if you want to be free.