Muckrakers exposed all of the flaws in society and the government and a lot of books were written about the problems there were. Poor working conditions, child labor, and quality of processed meat and other foods were big issues. During that time period people were big on from of press so that and the fact that people were just fed up in general led to reform.
If you were to break down Churchill's famous quote, you would see this:
Riddle, Mystery, Enigma. These three words are key. They are all connected. What is the connection --- these words describe a secretive and mysterious meaning. The best way to understand a puzzling quote like this is to break it down, and define each and every word; Forming a more understandable explanation.
Whos Adolph Hilter?
I only know of a Adolf Hitler
It is protected by the fact that it has a system of separation of powers with three branches that control each other and prevent tyrannical behavior from a single branch. They are also separated into local provinces and autonomous regions that are ruled by small scale governments that have some degree of independence and that could easily oppose a new form of tyrannical government.