Are these sort of incidents not just a consequence of the growing popularity of fell running and influx of road/xc runners? People that have been on the fell scene for a few years will (I imagine) have adopted the generally accepted behaviours/attitudes e.g. sportsmanship, stiles, friendliness etc.. Those fairly new to the scene may just be ignorant of the affect of their behavior. All that's needed is a bit of friendly education. (...and if that fails - drown them in a bog!)