Yes good post. I can really see it coming.
Of course, the cut off age for not DF being 18 is a bit absurd as maturity varies from kid to kid. It's a very secular choice. My boys are still like kids at 18. I can't fathom the cruelty of throwing them out at that age. They wouldn't stand a chance.
Remember the Bible didn't recognise adulthood until age 20 so they should at least use that as a guide.