With regard to the idea of these individual groups being a danger to society, when I look at your research, the end result is about 20% over 10 years of involvement in some kind of violence, which would be either verbal, physical or online.
How serious is the danger that they pose? There are “threats and hate speech” listed in your categories of violence, also “vandalism”, “mischief”, “physical conflict”, “harassment and bullying”, “attacks and assault” at 6%, and “terrorism” is 1%.
Are they a serious threat and danger to life and limb, or are they at a lower level than that, for the most part?