If one were inclined to be charitable, a certain amount of license on the route to the hot springs might be considered as Castro conducts business with visitors. Complications develop. Although these duties would be appropriately performed by a ranger, BLM has abdicated their role and Mike has stepped into the vacuum.
When a private citizen is given a law enforcement role for which he has no training, the stage is set for abuse. That is why there are laws against this practice. In this case, BLM has looked the other way to avoid taking responsibility.