"He would go to Ramapo and Ringwood and Allamuchy with tools specifically for the purpose of removing such things, because he said the feet of humans, horses and animals are the only thing that should ever touch the trails..."
what a load of crap......!! Before highways there were trails, I don't think he has a problem driving his car on a highway where A TRAIL used to be. Things change. Move on.
Oh and other thing about the liability....the only person liable is the mountain biker. Stop trying to blame somebody else for your inability to clean an obstacle being man made or not. Ride as per your limitations and walk it when not sure. If you decide to try something and fall, well it was your decision to try it, why trying to find blame? If you see something (an obstacle, etc) walk it first if not sure, check if it is stable. Don't expect everything to be 100% in "working" order. Conditions change and even a man-made obstacle that has been approved and built to spec can fail, it is simple "wear and tear". I agree that people can't just go out there and build trails, but c'mon a couple of rocks or logs here and there!! I am not talking about a 10' teeter totter in the middle of the woods!! It is stuff that is already out there in the woods (rocks & logs), it is just "re-arranged"
I've fallen many times, endo-ed, etc, and I don't think it was ever the log's or rock's fault, it was MINE!! big deal.
So next time you see a fallen log, don't build up a ramp, bunny hop it, that way they will leave it alone