We’ve seen similar things like this before in the USA, remember back to the 60s and 70s, we had the Weather Underground, Symbionese Liberation Army, Black Panthers, Charles Manson Family, etc., all cults who attracted young people to engage in terrorism and violence.
The thing about this article is if some group on the “far right” like the Proud Boys, etc., held a summer camp for kids, there would be calls to immediately shut this type of activity down and calls for a federal investigation to be launched.