We have our own version of these people. They are called foot golfers.
They put the foot golf holes into our par-3 about two years ago. There were more than a few kids that got out there and figured they could do whatever they wanted. Had one of the snots come out from a clump of trees right after I hit my tee shot. I screamed fore as loud as I could even though they weren't close at all to getting hit. Scared the piss out him.
Actually, haven't seen as many foot golfers this year.
I guess if you don't play golf at all, have no clue about the game, are totally non-observant then a stroll across some beautiful green acreage is a wonderful, yet dumb thing to do. This attitude goes for some automobile drivers, too.