Even if that were true, just think of the impact an "issue ad" with the following scenario could have:
Doctor (stripping off his mask after performing an abortion): Alright nurse, clean up this mess.Nurse: Yes, doctor. Oh...wait. Uh, doctor? ... the...uh...fetus is breathing!
Doctor: Take it away with the rest of this mess. Put it in the broom closet.
Nurse: Yes, doctor.
[Nurse is shown bundling the infant hastily and hurrying out of the operating room.]
[Next scene: A door opens and the viewer sees a pair of hands shove the bundle onto a shelf in a broom closet. The door closes with a click. There is silence for a moment... then the viewer hears a tiny cough, then a weak cry.]
[Fade to black.]
The fetus-in-jars people have done more harm to the pro-life movement than any 10 abortionists.
I am pro-life and I would absolutely reject any candidate who ran such an ad. But, we will never see such an ad.