Because if a lifeform that resembled a fertilized egg, even a day old, was found on let's say Mars, it would be the most important scientific discovery in History.
Checkmate
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A good comparison to this would be: A brain-dead patient.
When is it okay to legally "pull the plug" on a brain-dead patient?
When they have no chance of recovery. When there is a clear knowledge to that fact, that the patient cannot, and will not become un-brain dead.
The difference with a Fetus?
It has a near 100% chance to become un-brain dead.
Life begins at conception because the probability of active brain cells developing are near 100%.