Politics. I support candidates who make an exception for rape and incest for the same reason I support candidates who are in favor of Social Security. To call for what I'd like, the immediate elimination of all entitlements, is political suicide. Just like calling for a complete ban on abortion would be. So I compromise.
Ok, another question.
Since the majority of the population supports socialism - would you vote for the socialist candidate as a nominee in the hopes of winning the election?