Having an abortion only makes two victims instead of one.
The child is not responsible for the actions of the father, it is not the child's fault how their life was brought about and murdering that child only causes another victim.
I recently read a story of a woman who was raped on her way home from work, she walked every day. She ended up pregnant and her and her husband decided to keep the child, even though it was the result of a horrible experience. The husband was at first iffy because everyone kept saying "how can you love a child that isn't yours? But belongs to a man who hurt your wife?"
Yet when the child was born, he said he could love him because half of that child was his wife, whom he did love. They have never regreted the situation and the wife admitted that it was because of that child she was able to overcome her horrible experience. The child healed her and she is so happy that they decided to keep the child.
There have been numerous stories like this. Always, it's how that child healed them and how it was the best choice of their life to keep that child.
You can look at it two ways: 1. Bad experience, get rid of it. Or 2. I'm going to raise this child right, so that I put one other person in the world who won't do such things.
It's a hard choice, one that I've never been in, to decide that. But there was one point where I thought I might have been. I had a major operation and I missed my cycle for almost 4 months in a row. I was beginning to think I had been possibly raped while under anestetics. I had to make that choice even though I wasn't pregnant in the end and that choice was to keep that baby.