Good point!
You might even do worse than scare them....depending on how bad the times are they may not appreciate the intruder.
I know I've chased off some folks who thought that they had the right to be on the power line that runs across my property (it's leased to the power company--nobody else).
So it's probably a good idea to at least concider whose land you are crossing or at least how close you might be to houses/barns/etc.