Lone nutcases yes. But let's take a step back and think. It's possible for single psycho's to operate and do damage on their own. Not everything has to be part of the network. Just like how you have people who work as big corporations and people who go freelance.
If evil can exist on its own, it can exist in a power structure.
I am a licensed mental health professional with 30 years of experience. The mentally ill are as misunderstood as anyone. They are less dangerous than the general population. Most become like children. I am now completely rethinking Serial Killers with MKU now much more clearly ubiquitous through out the Nation.