Social Role Quotes
"Extremists" as Flexner used the term were intellectual and philosophical extremists--at that time intellectual communists, fascists, atheists, libertarians, anarchists. In the 21st century, "extremists" tended to connote violence and terrorism. There were violent revolutionary communists, fascists and anarchists, but there were very few. Must were intellectual and philosophical advocates of the theories.
This 12th century observation which appears so obvious has been ignored by the vast majority of Islamic scholars and writers subsequent until modern times, and even then they represent the small reform minority of Islamic thinking.