Indeed, the abortion issue must be exponentially more severe when one considers the soul. IMHO, it is impossible to justify abortion with that consideration, and therefore I wonder if the greatest resulting soul damage is to the abortionist or the mother?
There is a related warning in the Old Testament which is repeated three times, signifying great importance. Roughly it says never seethe a baby goat in its mothers milk. That is one of those passages which speaks directly to my spirit in ways too strong and complex for me to explain adequately with words alone.
For one thing, I am overcome with the sanctity our loving Father decrees to the trust between an innocent baby and its mother at the animal (nefesh) level. I cannot imagine the magnitude of His outrage when such a trust is violated at the higher spiritual level (neshamah.) It is beyond my ability to express.