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Childless women (those who have never been pregnant), women who have had natural miscarriages, and women who have aborted all have a statistically similar risk of breast cancer.

Come on, you know better! You betrayed it by including miscarriages in your list. (Miscarriages physiologically are similar to abortion.) About HALF of abortion cases can be associated with abortion and some others with miscarriage.

You said: "About HALF of abortion cases can be associated with abortion and some others with miscarriage. "

If you can't understand the statistics you're using to make your point, it's best to stay out of the debate, IMHO. Read the studies carefully, with a critical eye instead of a hopeful one (for science is nothing if not critical). If you still can't understand it, here's an explanation in layman's terms:

I am an unmarried woman who has never been pregnant. I currently have X% breast cancer risk (based on lifestyle, family history, etc.). If I got pregnant tomorrow, I would still have X% breast cancer risk. If I killed my baby in utero three months from now, I would STILL have X% breast cancer risk. If I kept my baby but then lost him or her in my sixth month of pregnancy, I would STILL have X% breast cancer risk.

Now, if all went well with the pregnancy, I carried it to term and gave birth to a bouncing baby nine months from now, I would have a lower-than-X% breast cancer risk. By breastfeeding, I would decrease my risk level even more.