I disagree with this and what Dinnerbone says about locks. It doesn’t matter who file was intended for, it’s on the internet, if people want to use their silicon to do some mathematics to turn some numbers into some other numbers that’s their choice. It’s not equivalent to breaking into a house.
I personally don't see downloadability as a significant factor in the morality of breaching security. If it's bad to hack a login screen to gain access to private information, why wouldn't it be bad to hack encryption to do the same thing? What moral dimension does downloadability alter?
I think the house analogy fails because you cannot duplicate a house, take it somewhere else, and attempt to break into it there. If you could, that would undoubtedly be seen as a violation.
I agree it's not the equivalent, but the file could've contained things like Minecon attendees. That would still mean it's badly secured of course, but putting a huge community effort behind it and youtubers making 'Biggest Secret in Minecraft' videos about it would suddenly turn into very bad taste.