Certainly that's not the full cost. It just subsidizes it heavily. (Not that it's a bad idea to do so. Just that $7 isn't the real cost.)
Parents need to have the income to support the family. They end up putting the child in childcare and taking on extra-work or if they are fortunate to rely on family members to afford childcare.
Should you not have children if a parent can’t be home during their early childhood years? That’s more philosophical.