Why does senior feel that the common goal of raising a child who is 'happy' is an unfair burden to place on both parents and their children?

According to Senior, parents are more involved in raising their children than in the past. It has become so important for them to make their children happy that it feels like a burden both to the parent ad the children.

The happiness of children is important but parents should not try to impose it on them.

They can teach them other things which are more achievable like how to be purposeful or how to be a decent human being.