All I've found in the posted article is "it's not the right time" (no explanation), and in a post above from a Feb report, “South Dakota Right to Life does not support HB 1191 in its current form, but we are working to get it into an acceptable format that will truly protect lives,” (with no explanation of what that means, exactly).
This is really sickening. It would be like MADD helping defeat a bill to outlaw underage drinking (weak analogy but makes the point).
It seems so incredible that there must be more to the story. If there is no more to it than timing, then they are insane.