You’re citing leftist human rights watch? seriously? Duggar, at 15, was close enough to 18. It’s not like he was 10.
It's not like he was raised in a house of prostitution, or was subjected to porn films at home, either. He was trying to cope with sexual urges about which his parents had kept him in total ignorance, his being homeschooled with no television or access to information. I'm not trying to excuse his actions, but I do think the parents bear a lot of responsibility for not understanding his situation and giving him clear guidance as, or before, he hit puberty. In a sense he is a victim of their putting their heads in the sand and circling the wagons. Michelle is a dip, but JimBob has been out in the world and should have done better by his child.
Where I used to live there were a lot of Amish folks. I remember one day shopping at a marketplace where the Amish would come in from their farms every morning to sell their produce and baked goods in a big east coast city. There were a lot of kinds of vendors at this enormous market. I saw an Amish girl around 14 in her gray dress and white apron and bonnet, crouching behind the counter at a magazine stall. Apparently the stall owner was out to lunch, giving the Amish girl the chance to avidly peruse a smut magazine.