Isn't it more like finding the door of your home open and getting in
And you have permission to be inside?
It's more like finding a house with an open door, and smelling gas coming from inside, a potential hazard for the house and everyone else around.
Or, an even better analogy, finding a car that is open, or already with thieves inside, and closing the door having previously chased the thieves away.
Oh, and leaving a note about what you did and that you should get your locks checked or changed.