Granted, some of your peers might date without any intention of marriage. They may view their opposite-sex friend as nothing more than a trophy or an accessory to be seen with in public to boost their own self-esteem. Playing with someone’s affections in that way is cruel, and it comes as no surprise that such relationships are often short-lived. “Many young ones who date break up with each other a week or two later,” says a youth named Heather. “They come to view relationships as transitory—which in a sense prepares them for divorce rather than for marriage.”
What's wrong with relationships that are short-lived? Even in their world of "dating with a view toward marriage" I don't see why breaking up after a week or two is such a bad thing. If you realize you're not right for each other after a week, wouldn't it be wrong to continue dating - wouldn't that be "playing with someone's affections" - the very thing they condemned in the immediately prior sentence?
In any event, I think we can all agree that the policy on dating is unhealthy, overly controlling (big surprise there) and enacted in order to keep people in a child-like state of naivety and trust for longer, all for the purposes of keeping people under their influence.