As far as I've understood, that is precisely one of the reasons the current pope has such a strong base in Latin America and so many in that part of the world wanted to see him as pope.
The Jesuit University System (SUJ) actively promotes liberation theology through curriculum in Mexico, and I would expect the Jesuits have similar structures and programs in other countries and parts of the world.
Sure, life is imperfect, but is that really a reason to espouse something as radical as nonexistence? I find that the imperfection and thereby dualism of existence is part of what makes it beautiful; we get to experience both the good and the bad, pleasure and pain.
I guess in some sense what I understand you're saying is that to you, being thrust into the pain inherent of becoming and being alive, is the consequence of a bad moral or ethical (selfish) action and therefore wrong even if the children are able to adapt, because there is always more potential suffering throughout the course of a life. I get that, I think most of us would love to be in situations where we could have no-suffering-guarantees for our children.
Maybe the point of friction is that it seems to me like you believe that there should be no suffering at all for it to be ethically permissible to have children (lest it be selfish) while many of us believe that the "base level" of suffering inherent to life (eg. death of parents, the setbacks of infancy, social interaction, etc.) is permissible, and it then falls on us as parents to make sure that there is no or as little additional or unnecessary suffering as possible by means of safe environment, education and tools to cope and overcome so that what could potentially be suffering doesn't become so. When it comes to that I believe it to be more reasonable to discuss who ought and who oughtn't be a parent than whether it's ethical or not to have kids.