hmm that's a bit like saying it's OK for me to punch a stranger in the face if I do not know in advance that they do not want to be punched

Extravagant examples aside, it's as well to remember that because something is legal (or illegal) or acceptable (or unacceptable) in one country, doesn't rule it out in others.

The stateless nature of the internet of course makes the point a bit moot until the jurists get some case law under their belts about this sort of thing.

Philosophically it's rather interesting - I've recently developed a roll of film that was in a camera I bought; it contains some holiday snaps, nothing contentious or (to me) very interesting.
I certainly feel I own that roll of film.
I don't however feel I have any claim of ownership to "the images". Accordingly I don't feel comfortable to publish them.