Have had happenings similar to the OP while elk hunting before too, but some times  stories tend to need a lot of room to really tell the whole thing correctly.  I think the OP made a great example of some types of things that can and do happen, so I won't go off again about anymore of mine.  I was watching just last night where someone was turkey hunting on some private property only to have a poacher drive right through (caught on camera) and scared the gobbler away.  They devoted a minute or two to talking about trespassing on private property and poaching and how it can ruin someones elses hunt and how trespassing and poaching is illegal and how it's not right to begin with.  I forget the name of that hunting show.