It's possible, but your are of course speculating. I really didn't spend much time on those links, but I did read through these:
Exercise
Exercise
Smoking
Smoking
Milk
Nightshift workers
Diet
Drinking
To be fair there were more than a half dozen studies there regarding delayed child birth, breast feeding and estrogen, but I'm just posting these to demonstrate other correlations exist. I suppose it's possible that the people who practice these behavior are more likely to have more abortions, and it's the abortions that cause the cancer, but unless the studies accont for that, we're only guessing.
I've spent more time on this than I intended. I just want to make it clear to people here that there are other behavior linked to breast cancer so the abortion link does not prove a cause and effect.
In the end, all these other areas are red herrings, an effort to provide alternatives to the glaringly obvious real answer. They are desperately looking for some other "big" factor to hang this on, but they know in the end the number one and two highest risk factors are abortion and the pill.
But because that does not fulfill their pop con and abortion rights agenda and bias, they will continue deceiving poor saps who buy their propaganda as "unbiased" and "scientific."
And frankly, dishonesty and deception are not beyond researchers with a pro-abort bias and agenda.
The media coverage of the Melbye study, trumpeted as THE PROOF denying an ABC link, failed to mention that Melbye even found a 42% increased risk for br ca among those having an abortion before first full term pregnancy.