They want children to be baptized to "lock" them in. The children want to get baptized to please their parents. All children want to make their parents proud of them. When they get older, perhaps late teens or later, and they realize that being a JW involves believing in "divine lies," they know they will loose all of their family if they are DF'd or DA'd. The Borg knows that if they keep losing the youth, they will be nothing in 20 years.
Sour Grapes