Abortion causes breast cancer?

We cycled by this sign in Kansas. I must have been to focused on the horizon because I failed to see it and take a photo, so I just took a photo of my friend's photo. Double photo action - whoah! That means if you took a photo of the photo below, that would be triple photo action, and a photo of that would quadruple the fun, and so on... So does anybody care to explain the logic behind the proclamation below?