As ever, some nutters always spoil it for others, in your case seems to be bikers, but some 4x4ers are as bad.
You can see the cars we are driving - not tricked up old 90's, but basically standard road cars.
The club I'm is is a member of the Green Lane association which has a code of conduct for driving lanes. In principle, you don't wreck them!
Some walkers complain that cars are causing erosion - but if you look at the popular walking areas - The Peaks etc, then there is a massive problem of foot traffic ruining the country side too! At least in many cases, it is the offroad community that repairs the green lanes so that they are kept open.