Semantic arguments about the meaning of stealing are only appropriate in discussions about copying other people's stuff. When it's our stuff getting copied, then it's theft plain and simple.
It's not the fact that the passwords are being copied, it's that someone without access took access.
The closest analogy to media piracy is someone with a password telling it to their friend.
In short, the difference is between 'sharing' and 'taking'. It's not about whose data. It's not hypocritical.
(That said, feel free to disagree with the opinion, but don't accidentally strawman it. Maybe it would be better to use a different word here too, but this sort of thing is much closer to theft because of that lack of consent and breach of privacy.)
So... I suspect there's some trolling going on but the problem with password/creditcards being stolen is that they steal my monies out of my bank or mess up my twitter/facebook/youtube/etc account. Depending on who you are, that could be a real problem.
The piracy issue is about outdated-business models being supported by ridiculous laws with insane consequences.
