I think this was addressed in the post with the example of school conformists who "rebel" along with the rest of their group doing the same things, with the same clothes, language, fashion, music etc.

In your example, the aggressive alt-right "individualist" would be the equivalent as the high school rebel who is just acting a rebel and conforming to their adopted group.

Conformists are essential for any group cohesion. I imagine a key part of a conformist in any group is to define the out groups.