You don't have to chop someone's rooster off because they wish people shared their opinion. This thread is going to lead to flames and bans.
I personally don't believe a human has the right to end any sapient or potentially sapient life, regardless of the circumstances.
Rape is a horrible occurrence, but a child as a byproduct of that is still a part of the woman and not hers at the same time. For her to decide the fate of whether or not that child lives is out of her jurisdiction. It's a (potential) life, not a tumor.
Even leaving the child for adoption would be greater than ending it. At least in that scenario they have a chance.