So what you're saying is... Slavery was legal...it should not have been an issue for political parties in the US prior to the Civil War. - - When moral issues can't be represented by parties to our government, then we'll have a completely amoral society (which we just about have, anyway).
Logically speaking, if abortion is forced on the unwashed masses...instead of being a "choice"...then it should be in the political arena.
Our society is amoral not because of abortions (which have always been a part of our society) - but because we have been conditioned to be faithful to our politicians and politics - instead of trusting in God.
People like you - want to trust politicians to make moral changes that they will never be able to make...because those moral changes can't be legislated, those moral changes begin in the heart, and those moral changes are placed there through grace.