I'm frustrated with (though don't take offense to) depressingly stupid logic. You're using the phrase "you know X is morally questionable" as though it is established that there are objective moral maxims to follow (there are), and then basically nuke the whole concept of objective morality in _your_very_next_comment_ with the phrase "Of course, morality is purely a mental construct." I already know you're going to reply to this with some obfuscating bullshit about how that "doesn't" invalidate aforesaid concept by saying the same thing, with the same logical inconsistency, with slightly different words that ever so slightly change the phrasing to invalidate the precise way I called out your logical error, so I don't expect this discussion to go anywhere constructive, but yeah, you goofed, dude.
As for the second part, I don't take offense to anything, but I do take exception to the other logical error present. Why is it that people are allowed to donate old items to a charity or church with no issue, parents are allowed to hand down items to their children in their wills, and I'm allowed to give my brother or friend a video game I bought as a birthday present for them, but a guy who purchases an audio recording isn't allowed to give it away online? If you really want to make an accurate comparison, it's not "art should be free" (which is a hideous misinterpretation of what is usually actually meant in the first place -- this is almost always used as a rallying cry *by artists* against inane First Amendment restrictions -- but I digress), but "after I purchase something, you have no right to tell me what I do with it, provided that I'm not using it to violate others' rights."
The artist whose music is being distributed either:
1. Was paid for the audio recording by people who then distributed it elsewhere (in which case, like articles of clothing bought to be given to a church/charity drive, such distribution ought not be restricted);
2. Put the audio recording on the Internet for free download in the first place (in which case, who's distributing isn't a relevant concern); or
3. Had a computer of theirs hacked to acquire the audio recording (in which case there has been a property rights violation -- the unauthorized tampering with the computer -- which ought be illegal).
So, no, I don't feel any sympathy for an artist that I don't also feel for a clothing manufacturer or a car manufacturer or... well, *anything* that one might acquire through a gift or inheritance or any other means. Anyone could theoretically reproduce any physical item and give it away (maybe my grandmother, back when she could still quilt incredibly well, might make a blanket like one you'd find in the store); punishing "pirates" is tantamount to punishing people for being able, with perfect reliability, to quilt or build a perfect replica of a given item nearly instantly. It's a stupid practice that can only stifle innovation, artistic creativity and technological progress.