You are right in your answers.
The world sucks, but parents have children because they still have hope.
And it's more than just the physical act of giving birth. A part of the parents' hearts and emotions are tied up with their children or should be. I won't get into those that have no natural affection for their offspring.
Whatever a child experiences the parents experience it, too. Joy, pain, suffering, elation, depression, etc. and so on. Parents sacrifice a lot more than their children realize. They give up time, money, and their own wants and desires, to put their children's needs and wants first.