Well Andy, in Scotland there has been for many years no law of trespass, and now there is a right to roam, and to wild camp. Of course, some landowners are trying to resist this, in a variety of nefarious and illegal ways, so yes, some bad things are happening, but all one has to do is to POLITELY STAND UP TO & CORRECT THEM.
The Scottish Government has also facilitatted and part-funded a number of community buy-outs, where land is becomes owned collectively, and here visitors are positively encouraged, with additional facilities often being made availale at bargain prices - eg in Assynt, a former private estate, where the trout-fishing is famed, a week's Rover Ticket for literally thousands of lochs in world-famous scenery costs just £25 - and of course you can wild camp in this glorious wilderness.
"I think the Norwegian "allemannsretten" (freedom to roam) is a good way of organizing things; freedom and rules in a good mix."
Agreed, and it's similar here, mutual respect, care for wild and commercial animals, birds, the environment, closing gates, leaving no traces etc - it's not rocket science.