They need to be taught to respect other countryside users. Back in July a group came past ours - they had taken a shortcut across three hay fields with standing grass, left 2 gates open letting cattle into a sssi haymeadow, and knocked 2 walls down while climbing them. There was no sign of supervisors while this was occuring. When I asked them what they were doing they just said DoE and carried on. The landowner hadn't been informed or shown any risk assessment before the 3 minibus loads of louts got dropped off.
That's a problem with the training - the school is supposed to cover countyside code and behaviour and a team like that should just have been pointed in the direction of home and told to walk.