when we bought our property from my parents, the lovely neighbors had built a tree house on our piece without my folks knowledge, and when we asked them to take it down they replied "why??" we said, well, that's our property, and we have horses, so we are going to be fencing, and don't want anything that can potentially hurt the horses, so please take it down, oh and if you could also please remove the trees that you planted on our side of the property line, or else they will be bulldozed under, a year later everything was still up, and planted, so I rented a bulldozer and made a distinct effort to plow the entire property line as defined by a laser pointed at reflectors on the line markers, and corner markers, by by tree house, plants, anything of theirs that was improperly placed on our side, was GONE, but they had been warned
I have always been taught to ask before going onto anyone's property for ANY reason, so it upsets me to see people, kids, adults that just go where they want with no regard for the hard work that others have put into what they own