An extremist, in the current parlance, is someone who disagrees with "modern society": the combination of industrial capitalism and personal liberty in democratic systems that defines the progressive West. All of Europe and North America and most of their allies have some variation on this type of system. Even further, it is upheld as the reason to support the West in its crusades: we bring you "freedom" and a nifty product-oriented lifestyle.

However, such modern society is by definition very popular, because it tells everyone they are liable only to themselves and their own interests, and that there is need for no other social involvement. Do what benefits you personally, both materially and in social status. Most people do not understand why anyone would oppose this, thus "extremists" tend to work through that form of guerrilla warfare native to our time, sometimes called "terrorism."

What is Extremism and Why It's Our Only Hope

WE MUST THOUGHTFULLY CONSIDER THIS
AND THEN EXTERMINATE THE MORONS

DEATH 2 MORONS = HOPE 4 HUMANITY