I just got a new one!
"Not having kids is CRUEL because you're not thinking about all the people who can't have children. It's just like, laughing in their face because you can have kids but refuse to!"
That sounds like when Dawkins claimed we should all be happy to alive because we are the few that made it.
This one is so risibly paternalistic, that it's outright brilliant: http://www.nytimes.com/2012/11/16/opinion/brooks-the-age-of-possibi...
I quote: "People are not better off when they are given maximum personal freedom to do what they want. They’re better off when they are enshrouded in commitments that transcend personal choice — commitments to family, God, craft and country."
So the purpose of having kids is to constrain and channel one's otherwise unfettered tendencies. Children are good precisely because they limit our choices, for otherwise we'd run amok, and would ultimately be unhappy.
Freedom is slavery!