If you are actively poking around at someone's home and you find an unlocked window, you don't think there is a moral obligation to inform the owner of the security issue? No moral issues if you then find a group of hoodlums down the street and announce that house 123 has an unlocked window?

I can see if you were just driving by and saw the window open, you don't really have any obligation (unless you plan to announce it publicly) but if you are actively seeking out security flaws in someone else's property, not disclosing it to the owner and then announcing it or worse, selling it to potentially bad actors seems morally reprehensible.