The whole thing is messed up on a practical level. We all know JWs who are on their second or third marriages, elders included.
Baptising children used to be almost unthinkable (it's gone back and forth) but if they can't buy alcohol or drive they certainly shouldn't be making a lifelong vow of any sort - baptism or marriage. Ever. It's just ridiculous.
The whole thing is just a set up for failure. But the high emotion/trouble/failure/confess your sin/beg for forgiveness/back into favor cycle is a part of the control of the JWs. Ask a JW why this is a healthy way to live and you'll get a blank stare, or they'll run out the door.