Earlier quoted context omitted.
It might be. The child lasts far beyond 20 years and within that time frame there will be ups and there can be downs. Really bad downs. A child can grow up to hate you, be your enemy, become a criminal, become addicted to drigs. It is not a guarantee for happiness. Statistically speaking though, when measured scientifically people in general are actually found to be overall less happy with kids. This is the scientifi…
There are multiple types of happiness, eg present short term mood vs overall life satisfaction. In your study parentd give a lower 1-10 ranking when asked how they feel in a particular moment, on random timers. When cleaning up shit of someone you love, sure it sucks at that particular moment but your life's full of meaning.
So given that we can have two persons with life full of meaning, one of which is feeling down most of the time, and both of them somehow selected this life for themselves - its not quite hard to point at not having children as a better way of life. I speak of course from the point of view of me/solicity - others should have as many children as it is required to keep my precious useless stuff mass produced overseas to keep numbing consumptionism continuing until nothingness takes me back.