t'aint natural
The point you raise is interesting, but I think you have quoted the wrong bit of Rule 5. Land clear applies to planks, not helicopters.
For helicopters the requirement is to land without danger to persons or property on the ground.
In truth, the whole of the aviation legal framework in the UK is a set of booby traps for the unwary or the unlucky. It all starts with the first few words of various sections of the ANO: "An aircraft shall not fly..."
Why is it like that ? - why to prevent the merest possibility of the regulator being held responsiible for taking any decisions or anything else.