At some point we're all ok with killing in one form or another.
I happen to think that killing a 'potential human'
that cannot survive on it's own is acceptable. For that matter, there are grown adults that I'm perfectly happy admitting the world and human race is better off without.
Most of us, if we're being honest can probably come up with at least half a dozen specific sets of circumstances where we would be comfortable with the idea of ending a life, let alone a 'potential human'.