The Department of Harassment and Subjugation (DHS) listed the nonviolent Valve Turners as "suspected environmental rights extremists."

To criticize climate defenders as "extremists" shows the conceptual error in using "extreme" to define "dangerous". Not all extremists are dangerous, only those who lean towards violence when there is no justification for violence. When plutocrats have maneuvered almost everyone into disregarding the harm that plutocrats are doing, the few who try to oppose that are by definition "extremists" -- but that doesn't make them a menace to society. Quite the contrary.

The right concept to use here is "fanatical".