I've said this before here but most parents -- fundie or secular -- would do just about anything to keep their kids safe until they're grown. I include myself in this group. Moving through our kid's teenage years was scary.
That's why these parenting methods that guarantee success if you follow them exactly -- from John Rosemond to IKDG -- are so alluring. We all want to be absolutely certain that our kids will safely negotiate childhood & adolescence and reach adulthood as great human beings. Of course, the hucksters of these "how to" manuals take no responsibility for bad outcomes -- their response is always, "Well, you were doing it wrong."
@sableduck - you make good points about Josh's parents & his upbringing. I can't say that I'm very sympathetic towards him now but IKDG & his hubris didn't come out of nowhere. My sympathy is with their kids & with Shannon. I hope that these past few years out of the SGM cult and in Canada have changed their lives for the better, allowing them to see all of the possibilities for themselves and acquiring the tools to attain those possibilities.