It's not that they intentionally set out to ruin their kids' lives, but that they have no earthly clue what they're doing or why what they are doing is wrong. Somewhere in with those Lamaze classes, they should be required to take Parenting 101, a brief intro to child psychology, etc.
I'm not sure how you enforce it, though. Refuse to release the child from the hospital nursery until the parents turn in a Certificate of Completion that they've passed the test on whatever textbook is used?
Because, unfortunately, not every parent bothers to buy a copy of "What's Best for Baby" for the home bookshelf, and not every person who buys the book actually reads it.
Some of the young girls I worked with were always eager to ask questions of the more experienced mothers, and others responded snottily "he's my baby and I'll raise him my way" to any suggestion (including suggestions so obvious that they're right up there with "the diaper goes on the heinie, not the head" for common sensicalness). There was a story in our local paper about some teen mother who couldn't understand why her baby wouldn't eat the French fries with which she was trying to feed it. No one ever told her that newborns get formula, not Happy Meals.