abortion is an unfortunate necessity, in many cases the least bad of several bad choices.  im personally more libertarian than conservative, so the personal freedom to choose most influences my beliefs, and while i agree that it would be nice if all pregnancies were planned and wanted, that is not the real world. 
it seems hypocritical that the political ideology that supports self reliance and limited government wants to force the arrival of more people that will be partially or wholly dependant on the state and federal government. 
if everyone that wanted to outlaw abortion was willing to accept the financial responsibility for raising all the unwanted children currently aborted, i would be much more willing to change my opinion, just like if everyone advocating for completely open borders and amnesty for illegal immigrants was willing to deny any government services to all non citizens, i would consider that a reasonable compromise.