Extremes are political views that increase when the current system fails to convince enough people. In USA and Europe, extremes are growing because of the current failure of capitalism to provide people with lifes that match actual progress. As such capitalism is in its late stage, as was theorized, happening in front of our eyes to see.

Extreme right wants power for the fewest, the fittest for survival, the ones desserving the most. Extreme left wants power for everyone as equal, regardless of stature and place in society.

Not to mean that extreme left is instant heaven on earth, but it can't be said it's authoritarian.

Ooohhhh you're so smart