kieranmullen said:
If there is a plug outside someones house, should you feel free to plug in because there is no sign? That is a weak case for justifying stealing.
There are many things for which there are no signs. They are called social norms!
There was no stealing needing justification. By social norms, the public understands that this business has provided parking free of charge or encumbrance (including any obligation to enter the establishment). And this free parking spot had an EVSE, which was also free of charge or encumbrance.
Social norms do apply here. I wouldn't apply the same assumptions to all parking situations. For example some small businesses on busy streets have only a few parking spaces available. There is usually signage in those cases. But even if there weren't I wouldn't hog a space as a non-patron because it's clear there is a shortage of spaces. But in the case of a lot with hundreds or even thousands of spaces and clearly no shortage, I don't see an ethical problem, much less a legal one.
There is such a thing as implied consent. Which is why we have "no trespassing signs", and also why you might occasionally find one of these on what might otherwise appear to be a "public walkway", etc...