Statistically, reasons for an abortion constitute less than a single percent for incest and rape. Apart from these facts are a few others that we don’t hear from enough, and if there were exceptions to 'zero tolerance abortion’ (or acceptance of), then the following should be anticipated:
False accusations of rape (even incest) for the sole purpose of getting an abortion.
Endangerment of the mother during child birth and NOT being able to abort it is a motivating factor for GETTING HEALTHY - furthermore, if one fails at obtaining good health, then natural selection has discontinued their life and participation in society. (Making exceptions to abortion will have potential mothers taking the easier, nonconsequential route and take away any motivation they may have had toward cleaning one’s lifestyle up)
Having zero access to abortion means we have less women and men (girls and boys) running amok in debaucherous behavior, such as promiscuity and thus a deterioration of family values and structure.