OK. But once such children are created, they need to be cared for.
Thank you for a post full of uncommon wisdom and insight. /sarc
They are and always will be cared for, although, ironically, probably only by the Church. The Church takes in humanity that most people don't even recognize as such - the lame, the halt and the blind.
But the point the Church is making is that humans should not be doing this sort of playing at God and randomly, or for money, setting off the process that results in the creation of new human life.
However, the Church is always there, just as Christians were there to pick up abandoned babies on the hillsides of Rome in the first centuries. Plain old sex outside of marriage is not okay, either, but the Church has always had orphanages for abandoned bastard children. But the fact that Catholics go along picking up the debris left behind by the world in its wild flight does not mean that the Church does or should approve the behavior that led to this.