@juancarlos I checked some studies first, and I'm ready to agree with you with one caveat. (This isn't a detailed lit review, of course.)
Dahab and McCambridge (2009) speaks positively about strengh training in young athletes. It's a bit more vague on growth plate injuries than I'd like, but basically, the causes are "lifting inappropriate amounts of weight, using improper technique, or training without qualified adult supervision".
Matos and Winsley (2007) explain in detail why resistance training can be beneficial even to pre-pubertal children (who don't have the hormones associated with increases in strength). However, they also dedicate a section to overtraining in young athletes. They acknowledge that the data on that subject is limited and they insist that further investigation is necessary.
While this is speculation on my part, it's understood that young athletes are more dependent on their couches than adults would be. It's up to their trainers to recognise that and to prevent possible injuries (here I'll just say it in layman's terms: because kids and teens can be dumb or hot-headed. So either they'll push themself to do something they're not ready for, or their trainer will, and that's a lot of potential for bad times.)
Malina (2006) is an evidence-based review that also notes that weight training is relatively safe (with a caveat that half the studies reported injuries).
Finally, Myers et al (2017) devotes a section to injuries in resistance training. The consensus seems to be "no more dangerous than any other sport, with proper supervision". Though it must be noted that back injuries are very common among weight lifting injuries.
Conclusion
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Basically, weight lifting is safe if you know what you're doing. Granted, not all teens do, but common sense and a competent trainer should make sure they're safe.
In the future, I want to look at other possible mechanisms of injury aside from growth plate injuries: e.g. how does increased bone density influence growth.