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Nightwings my guess is you watched a fundamentalist latter day saint documentary! they're flds, whereas i grew up lds. the difference is that lds became more modern with society (although they're still outdated). flds people still practice polygam, but,
supposedly, within the last few years stopped practicing child marriage. i'm not certain what's going on there. i would like to know the documentary though :)
i watched a show about women who escaped flds helping other women and girls escape as well (occasionally young men and boys) and, i think it was from this show, but a woman was dying of cancer i believe. but they refused to let her seek treatment and decided to treat her themselves. i think this story was told by the son who left after this event but he said that she eventually started to vomit black liquid. and the men treating her said it was her body purging the evil which was making her sick.. but she died soon after. he has since learned she was vomitting blood. it's so heartbreaking
lds people seek medical treatment. they don't talk about joseph smith marrying several children and act like that, and other issues, were never involved in the church. but with that they don't practice polygamy or child marriadge so there's that ig.
fortunately my mom was never lds so when i turned 18 i stopped going with my dad to church and my dad still talks to me. some families ex communicate but i've been lucky to not see that happen to myself or others, i'm not sure how much it's practiced. and since my mom wouldn't let my dad baptize me, i never went to the temple, so i missed out on baptisms for the dead and other deeper mormon things
the only thing i can think of when you mention young adults leaving mormon society is when young men (women too but men are more expected to) go on missions. but they do that to try to convert other people, rather than leaving mormonism
