I don't know the layout of the area, but his concern doesn't seem to far fetched on the face of it. Him not being available to speak with the officer is irrelevant as well, it's still a concern of his and the daughter. If there are giant scale gassers close to power lines that could be damaged, and then cause subsequent damages, it doesn't seem like an unbelievable situation. I presume all the fliers either have homeowner insurance (or perhaps some have AMA even though not required where you fly)? It looks like for many years nothing has ever happened, but he has created a public record now of his concern, and I presume the landowner and now the fliers are all aware of it. Knock on wood nothing will happen, and his concerns are unfounded and irrational, but set aside the feelings you guys have about what he has done so far and try to look at this from this perspective; does his complaint have any merit at all? If so, think about what you can do going forward.