-- is it possible to develop a leadership that doesn't become tyrannical over time?

Let's flip it around:

Is it possible to develop a followship that does not fall for the mind bending tricks of a group of wanna-be tyrants?

Yes and no - we can create a group of people who can maintain a clarity of mind. But teaching other generations to have a core of values but be flexible considering a generations unique circumstances - thats very hard.

The Jeffersonian principle of an educated electorate falls apart when politicians appeal to emotions like fear. Even the brightest people fall victim to fear and can make some bad decisions as a result.

Well, it hasn't happened yet. But there is always that greatest narcotic of all -- hope.