I disagree. The very argument that abortion should be even considered an option was first raised by questioning the morality of whether or not it was legal to kill an unborn child. Why should conservatives be forced to use methods not even used in reverse by liberals?
Consider this quote by Ohioan:
I fear that too many on our side simply seek a feel good sense of their own moral superiority, to want to actually approach the issue tactically, as opposed to emotionally. (Maybe that is being unkind, but some of them sure do not understand the art of persuading the not already committed.)
The answer to your question of why is - to save lives. We have to do anything we can.