The report indeed did not directly examine this question:
Just of the hell of it, do you two believe in abortion?
I can't speak for M. Dodge Thomas, but speaking for myself:
Do I believe abortion exists, or do I believe that it's moral?
I believe that abortion is murder. That doesn't mean I think this study proves it causes breast cancer, however.
I am not pro-abortion, but I do believe in science. For example, if you are going to use science to show the early development of fetuses as a reason not to abort, IMO, you can't pick and choose.
I say this for two reasons: fudge facts to suit your case & your case is lost. If you (the generic you, of course) weren't telling the truth about abortion being a direct link to cancer, were you telling the truth when you said a fetus is an individual? If people can throw away part of your argument, they will throw it all away and your point will be lost.
And two, I think it is morally wrong to present a side you know to be wrong. Correlation does not imply causation. Unless you can say that 1000 women had abortions and more of them had cancer than 1000 women who didn't (plus a control group) there is no proof. That study does not exist. This study does not prove that abortion causes cancer.
It is the truth & not shortcuts around it that will set us free.