So because children were forced to work dangerous jobs it's okay for adult religious leaders to have sex with them? I'm not sure I follow that.

You should research polygamy in the mainline (Brighamite) sect if you haven't already. One of the last marriages to the the mormon prophet Lorenzo Snow was to a 15 year old. Snow was 57 at the time. This was not normal despite any assertion about children working.

Source: www.reddit.com/r/exmormon/comments/1c2omo0/the_wives_of_lorenzo_snow/