You are rationalizing the reasons for not having children for you, which is great. However, that isn't what this post is about. I don't think many people should have children, because they just aren't cut out for it anymore, because like you say,
Also many people do not even like to have children, because they are happy and contended with something else. Like me.
However, this is also a response to a degrading community through increased individualism. This might be better long term, or it might be worse - but it is having an effect (I believe) on how we are approaching the future.