On one side there's those who believe an embryo has fully human rights from conception, and on the other those who believe the foetus has no rights at all until birth.
Both sides seem to put forward their position forcefully and dogmatically as though they're stating the obvious, and anyone who thinks the ethics surrounding it may be a more complex is shouted down, especially by some on the pro-chioice side who seem to view anyone who doesn't agree with their stance as a misogynistic slave of the patriarchy.
Personally, I'm not in either camp and find the ethical questions complex, with this being brought home the other evening when I was reading that Incas didn't regard babies and toddler as having human status until the age of 3-4 (where they had a ceremony to mark this rite of passage) and no longer totally dependent on their mothers and past the most perilous time wrt child mortality. It made me question again my thoughts on when we should a human should acquire rights, and frustrated me that any discussion on this immediately degenerates into a slanging match.