When a 40-year-old man is killed, nobody in their right mind would say that an alive fertilized egg has been killed.
We would say a human being has been killed.
Why? Because a fertilized egg is not a human being, dead or alive.
That is why it is nonsensical to say that a human being has been killed when an alive fertilized egg has been destroyed.
All you can say, alive fertilized eggs have been destroyed.
Fertilized eggs are not beings, never mind human beings.
When a 40-y-o dies, we say a person dies. When a fertilized egg dies, we say a fertilized egg dies. The reason we don't say person with the egg is that the egg is a human in progress. But really, so is the 40-y-o.
Just because we say something one way or another, doesn't mean that we are denying that a fertilized egg is a human being.
The denial that a fertilized egg is a human being is a denial. The acceptance of a fertilized egg being a human being is the acceptance of such. None of it depends on what we say.
In other words, if a fertilized egg dies, someone might say, "A human being just died." Another person might say, "We don't usually say it this way, but you are right."
EDIT: When you are asleep, you are not conscious. Does this mean that you are not a human being when you are asleep? What about in a coma? Does someone stop being human just because he is in a coma?
Just because something "could become" does not mean it "is". Deal with reality, not what you want it to be.
