On the sites I work on these days,We run the show,from start to finish..when someone comes along/any trade on site... Your told OUR site rules...If we tell them not to do something,for whatever reason,and they dont listen,then they get f****d off up the road...tears and all.
If You leave kit/materials laying around for someone else to shift... it gets binned,then they are counter charged for the clean up and waste of materials....that way then,everyone pulls their weight, everything goes back in the shed/racks,your not wasting money..and the Idiots and tired cnuts have nowhere to hide...I