I see what you’re saying, and I believe you that there are such cases as you describe. I’m sorry to hear about all this, and I hope all the people involved are OK. You may be right that aliyah with teens is not a good idea, or must be done very carefully.
But I’m not necessarily convinced that on average such horrible outcomes are more likely among frum teens that make aliyah versus though who stay. Unfortunately some here also attempt suicide, join cults, use drugs, run away, etc… In your experience there may be more horror stories in Israel but that doesn’t mean it’s a general trend or more likely on average.