In defending abortion, a lot of people say something like, “If this baby was born, what kind of circumstances would be grow up in? If it was going to be severely disabled or suffering horrible poverty, wouldn’t it just be kinder to abort it now? What kind quality of life would it have?”
One response to this is simply to express outrage that people would consider “playing God” by taking it upon themselves to decide whose life is and isn’t worth living.
Another response is to point out that no one would make the same argument for babies outside the womb. Ask them what they would do if they knew of a five-year old child living in extreme poverty, with parents who beat him. Would they say, “Well, his life isn’t worth living. Let’s just kill him and put him out of his misery!”?
I’d like to respond in a third way, and that is simply to point out that quality of life doesn’t depend much on the amount we suffer. Suffering makes life hard, but it doesn’t make it low-quality. Quality of life comes from joy. It comes from meaning. It comes from bringing glory to God. Some Christians have endured great persecution and had even greater joy. Others have struggled with joylessness for a time, but still known their lives had meaning to God. If God takes pleasure in my life, if He is glorified in it, then it is a life well worth having. Look how much Jesus suffered! – and yet his life had as high a quality as it is possible to have.
Sometimes I think we make life harder for ourselves than we need to because we think the point is to avoid as much pain as we can. The point isn’t to avoid pain. The point is to live – to trust God and pour ourselves out in love for others, to “know Him, and the power of his resurrection, and the fellowship of his sufferings, being conformed to his death”. I think joy comes from courageously being who we are called to be, without holding anything back. Can a child raised in severe poverty or with a debilitating physical handicap do that? Of course. I’m not saying it will be easy. I’m just claiming it will be worth it.
(My more philosophical take on this is over here.)