When one starts walking up the causality chain of low probability events such as ever having been born, one very much end up in silly territory. "Oh, I'm glad that my parents got really drunk one night in High School and got knocked up, or I wouldn't be here." The 'touching story' I find rather manipulative. Remember the Snowflake babies?

Snowflake children is a term used by organizations that promote the adoption of embryos left over from in vitro fertilization to describe children that result, where the children's parents were not the original cell donors.
...
President George W. Bush has made public appearances together with snowflake children while speaking about his support for adult stem cell research and his opposition to embryonic stem cell research.

It's the same manipulative, emotional nonsense. I mean, clearly I don't wish for any of these people to not have been born. This, however, does not lead my to conclude that whatever circumstances in their pre-birth life they emphasize as crucial to their very existence ought to be specifically protected. Just as I don't think we should start telling teens to drink and screw more without contraception 'cause some people have been born as a consequence of this.

Thus, I felt an appropriately sarcastic, dismissive and insensitive response was in order.