> It takes two incomes to afford a family's lifestyle. Someone has to take care of the kid. Two people have to do the job of three people.

Being stay at home parent is one of the most lonely thing you can do. Yes, the parent who works in office and goes bowling with collagues is less lonely. But the one who is spending whole day with a small kid and no one else is much more lonely .They cant go bowling either, because they need to put kids to sleep. So, they have to try much harder to have any social contact.