I doubt this is going to the only case. Electric cars are going to become more and more common, and the hunt for an outlet at a parking lot is going to start mirroring how it looks at airports with smartphones.
That said, I bet there's more to the case in the OP than we're seeing. Probably they've told this man to stop before and he keeps doing it.
They don't arrest you for plugging in your smartphone in an airport. This is precisely an attempt to prevent it from becoming common. If everyone knows that is not something you do, then you don't need to put up signs.
That said, I bet there's more to the case in the OP than we're seeing. Probably they've told this man to stop before and he keeps doing it.