I have posted the following a few years ago:
> My ancestors thought it was okay to have kids during times in which many scholars where certain the apocalypse was due in the next 25 years, during periods in which the plague killed more than half of the population, during the 30 years war and in a time when there was a realistic chance of nuclear annihilation in the next 10 years. I am glad they did.
Today, as a father, I would add: as a potential parent, you are in no position to decide that your future children, grandchildren or great^x-grandchildren won't be glad to be alive. You don't know them, and most importantly you do not know and you cannot know about their world. In my opinion, this argument is nothing more but a convenient excuse to avoid the stress of bringing up kids. It is a valid reason to not want any kids because of the stress, but please don't rationalize yourself into peace of conscience by assuming that you can look into the future.