Wrong. There is nothing on this earth more sobering or more maturing than when you take responsibility for a new life. The childless can deny this until they are all blue in the face but it won't change the veracity of it at all.
Some day you'll have to explain the multitude of immature idiots with children that are clearly present in our society. Either having children imparts only a marginal amount of maturity on the parents such that there are childless individuals who have more baseline maturity than these individuals with children, or you are over-stating your position.
As more of a pedantic "that is a stupid point" nitpick, taking responsibility for a life is what it is, whether you are talking about a baby or a stranger.