Yes, this keeps happening because people keep dragging semantics into this argument. Words like "murder", "human being", "mother", "father", all of these are things we can debate endlessly over. Which is why I like to constrain it to things like:
Does pregnancy have significant physiological effects on and risks for a woman's body? Yes/No?
IMO, it really boils down to these 3 qs:
Do you believe sex bears responsibility?
Do you believe a fetus is a living being with rights to live?
Do you believe the woman has complete say in if she gives birth, even if it trumps qs 1 and 2?
For number 1, if you say yes then "punishing" someone for having sex is ok since they should take responsibility. Of course this is only for consensual sex. Currently, males do get punished if pregnancy occurs financially depending on the woman's choice.
For number 2, if you say yes then things get quite simple. It doesn't matter how the baby is created, once it's there it is everyone's duty to make sure it lives. The heinous nature of rape matters not if you truly believe the answer is yes. This is the question that usually gets glossed over by pro choicers IMO, since many think that "obviously" it's not the same as a human life.
Number 3 is where things get complex since it can conflict with 1 and 2. It also causes male frustration since the woman ultimately decides if he will have a child or not, and carry future responsibility or not.
This debate will never end because you will never find agreement amongst these questions. Due to that, it seems like giving the choice to the female is the least offensive choice, since no belief is forced on anyone. Although, people that say yes to number 2 will die fighting this since they believe society is allowing murder