Because the majority of parents are absolutely horrible at raising kids. Therefore, there’s too many traumatized, mentally unhealthy, abusive, unempathetic people out there.

I don’t want to bring someone innocent into this world who has to suffer through all of that abuse. They can be a great person, but humanity/society will still try to break them in some way or another (ex: you’re too ugly to find a man, you’re too pretty to be taken seriously, you’re too fat to eat that, you’re too skinny so eat something, you’re too dumb to listen to, don’t act smart because it makes you look conceited, etc). People would just hand them abuse after abuse until it all becomes “normal” to them.

Then, every once in a while they would come across an amazingly selfless human being…but that person’s kindness would never be able to make up for, or fully heal, all of the previous (and future) trauma that humanity’s jerks have caused. They’d have to deal with horrible bosses, mean co-workers, abusive relationship partners, manipulative and/or fake “friends”, etc.

There’s no way I could do that to someone I love.