-Denying a woman the right to do what she wants with her body
-Forcing your own subjective morals upon others so that don't get to choose
-Ensuring millions of abortions happen illegally without professional help where the mother may die
-
OP, what if your birth was due to cause of unwilling sex? Would you want never to exist? And about the subjective morals thing, you could technically get into that with [i]any[/i] argument in politics, like 'should murder be allowed' 'should thievery be allowed', etc. That's not an overly valid excuse.