They DO make incredible sacrifices: losing sleep, losing free time, everything gets messy and slobbery, kids are very expensive, they can get into trouble and worry you...on and on.

Then again, parents see the trade-offs. They'll have someone to take care of them later, to pay some of that forward to society, plus parents are often the kind of people who love babies/kids and take joy and pleasure in the process.

It totally makes the best sense to let every person decide if these trade-offs are worth it...but I do think we should support parents financially, as having a balanced age pyramid is an important thing for a society.