Why It's Ruining Everything
It takes a lot to develop a successful music career. You need money for instruments and lessons. You need hours of leisure time daily to practice and develop skills. You need family members to drive you around and take you to lessons and competitions. You need a butler to pick up all your crumpled music-writing sheets and broken guitar strings. None of these things are exactly overflowing in genuinely damaged backgrounds.
Most working-class Americans can afford, at best, a part-time butler.
Of course, there are musicians who are born so talented that they don't need any of that and build their own instruments out of the piles of dirty needles in their parents' bedrooms. But successful people from horrible backgrounds usually get out of those situations by doing things that are not typical for that background. This applies to all kinds of successful careers, not just music: If your upbringing really sucked, a big part of becoming successful will involve differentiating yourself as much as possible from the people around you. If you're from a family of meth dealers, you'll have to forgo spending your teenage years learning the meth trade. If your parents are poor alcoholics, you'll need to save up all those beer cans and trade them in for deposit money instead of learning the art of crushing them with your head like everyone else.
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It's like missing your own bar mitzvah.
But audiences don't want to hear that about their favorite musicians, because "staying inside practicing scales while all the other 15-year-olds drink until they puke" is far too boring and middle class and unromantic a story for the music industry. So instead, young music fans are left with the impression that, even if you're raised by homeless crack addicts, you can just party hard and one day the magical success fairy will come to you, too.
Sure, you say, but some people do make awful adolescent decisions and end up doing just fine. Well, some people can get away with bad decisions more than others. Which leads me to ...