Guess there'll always be people trying to live out fantasies based upon unsubstantiated theories - that bloke who hangs around Stonehenge, for instance, the one who thinks he's a druid?

As long as you don't expect people to take you or what you do seriously... and, most importantly, don't inversely impact others, not a problem. Eccentricity is a British - or at least English - trait. However whoever are doing this woodcutting sound like they might need counselling, to be fair.

Having said that, it has to also be noted that most of the damage I've seen to upland monuments, in particular, has clearly most probably been undertaken by the landowner.