I think the basic problem is that people who originally used the footpaths would have been locals who knew the farmers, who understood about bulls, cows defending calves, etc. They would've used footpaths to get from the blacksmith's to the church or the pub, not to wander about exercising their dog. Those folks weren't perfect by any means (poachers, and so on) but the present rules of footpath use and Right to Roam were formulated by people who move from house to car to office and back again. I expect they view the countryside as a giant public park, not an industrial area, which it is, the industry being agriculture.