If breaking someone's kneecaps extended their life by 20 years I wouldn't want someone to randomly break my kneecaps and feel good about it because they "did me a favor."
>I pirated plenty as a kid with no money
Neither age nor wealth exempts someone's stealing from being a crime. In fact I see it as worse crime as it sets a bad example that may be hard to change later.
I don't think you'd find much (if any) support on the moral angle either when it comes to people who genuinely can't afford to pay the asking price. I've never seen any authors, artists, etc. openly object to fans pirating their work in these circumstances but I've seen many of them openly encourage it. Seeing how you're equating the two, do you think they also like to have their kneecaps broken?
In reality these people could pay for music. A kid could ask their parents for money or go mow the lawn of a neighbor. Often many of these people who can't pay could sacrifice something else in their life in order to be able to pay. For people with poor financial aptitude often their expenses will grow to match their income so they will never be able to pay despite making enough to pay if they didn't spend the money on something else.
>do you think they also like to have their kneecaps broken?
If an artist thinks a child breaking their kneecaps is a good thing they are free to let it happen. But there is a risk that it gives the impression that other artists are okay with it.
I'm entirely comfortable with my choices and my effect on society in general.