That sounds like "we should fertilize all zygotes because otherwise people who would be happy to live wouldn't exist due to (for example) 13-year-old girls being inconvenienced by and frightened of pregnancy."
Look, I understand the randomness of it all. On the other hand, you wouldn't exist either if a different spermatozoa fertilized your mother's egg, and the "you" who exists today wouldn't exist if some piece of your environment had been different, or some piece of your past, or any number of other things. We are each of us unique and, for the most part, pretty darned attached to the idea of living, of being, of existing. And on the other hand, we have to realize that our coming into existence in the first place was totally beyond our control.
Fighting our own powerlessness to the death is ridiculous. Better, instead, to recognize and appreciate it. How horrible would it be if we really did control everything?
I'm saying this as someone who was told by my mother that I would have been aborted if they'd detected any prenatal birth defects; I have some traits that might have been considered in the "defective" range, for which they're currently working on prenatal tests. I'm still pro-abortion.
And more than that: if I'm selfish enough to prioritize my own birth over the life and wellbeing of my mother when I'm nothing but an unfeeling, unknowing blastocyst, how will I live well and unselfishly later when I'm so attached to my own existence?