Agreed. Probably should have written "illegal" instead of "wrong".
It may sound like a stupid defense but honestly some people out there just didn't/still don't know that sharing certain (copyrighted) files is wrong.
About 5 years ago (from what I've heard as this was before my time) someone at my company was selling DVDs to co-workers and made some statement via an email to everyone in the company that it wasn't a problem if he ran out as he'd just make some more. He truly had no idea that what he was doing was illegal until the legal department and the IT department blasted him.
No one reads the FBI warnings at the beginning of films (and music doesn't really have one of those) so ignorance really is valid point one could make.
"Ninety percent of baseball is half mental." -- Yogi Berra