I think it's a lesson to the parents so eager to do what it takes to see their kids hit the spotlight without truly earning it.
I'm not a fan of his music or offstage behavior, not that I really put any time into thinking about it normally, but this final comment of yours doesn't make any sense. Reading his bio on Wikipedia, it seems he was self-taught on a variety of instruments, went to various singing competitions and placed well before getting noticed by a record producer from a YouTube video, and has been hugely successful as a musical artist and tour performer since then.
Putting aside the usual knee-jerk Justin Beiber hate (for his music, not his antics), in what way has he not earned his fame, compared to how other teen pop idols have risen to prominence over the decades? It's not like he's some talentless hack thrust into the spotlight who can't hold a tune or give his target audience a performance they enjoy. Don't make the mistake of thinking that just because you aren't that target audience (which is fine; neither am I) that he hasn't worked hard and earned his fame as many have done before.
Now, that doesn't excuse his behavior offstage, of course, and it's certainly a valid point about the parenting issues.