First of all, you HAVE NOT given ANY proof to back up your absurd claim that post-abortive women who have mental health problems had them before killing their babies.
Secondly, it IS a litmus test to those of us who value the sanctity of life. Abortion has caused more damage to this country than ANY tragedy in American history, even the economic problems we have today are DIRECTLY related to abortion.
Finally, of course you can be a conservative without being "fixated" on abortion, but what you and your ilk want conservatives to do is IGNORE abortion.