If few abortions involve zygotes it's because most women are unaware they are pregnant at that early stage. 89% of all abortions occur within the first twelve weeks and therefore involve the aborting of embryos with beating hearts. 
While this might trouble some such as 40-20, fortunately such abortions are legally none of his/her business and therefore 40-20 will be forced to reconcile with whatever psychological problem he/she voluntarily creates in his/her mind. There are many psychiatrists and counselors who can provide help for such problems before they lead to violence caused by such delusions which seem to be disturbingly common among those professing to be "Pro-life."