Extreme vs. Mainstream

With my topic of white gangs in the prison walls, it is hard to understand or even see what is the difference between the extreme and the mainstream. The reason is for being the fact that what is seen from the outside of the acts that Aryan brotherhood or the NNLR does, from the outside looking in, it is seen as being extreme but from the inside's view it is seen as being what they believe is the mainstream lifestyle. With this being said, I cant understand where the 2 difference would be with my topic.Mainstream and Extreme have a huge connections when focusing on white prison gangs and White nationalist because of what the white folks are representing or even from what acts that they distribute to others of the same belief. White nationalist and white gangs are trying to portray their reasoning's for their action being because of the mainstream, but in reality its the extreme things that they do that gets portrayed as being the mainstream from crimes, inequality reflections, to murders. in result of this,I have learned from class matertials, discussion but even more from American History X, it is the reason of  white nationalist purpose and actions that they extreme things they do become the mainstream in our today's society.