"A fetus lacks sufficient neural abilities to function, and therefore to 'count', as a human person. More to the point, a fetus is basically unconscious, so it doesn't suffer conscious pains if it is aborted. Therefore, fetal abortion is not immoral or cruel."
According to Freudian theory, a human functions in three psychic dimensions: the id, the ego, and the superego. The id is the dominant, fundamental dimension, comprising the most basic somatic drives. The ego is just the "tip of the iceberg" in human behavior. The real engine is below consciousness. Human nature subsists in its unconscious functions. Delving into a person's subconscious is delving into the person's real character. Conscious behavior is by and large a lattice of pseudo-drives and confabulation constructed to protect one's id or even to protect one's own ego from one's own id.
In so far as a fetus is an unconscious humanoid, it is an archetypal Freudian agent. It displays all the somatic drives that an ego will eventually gild: homeostasis, nutrition, expansion, crude stimulus response, etc. Just because the fetus does not (presumably) consciously feel pain during an abortion does not mean the abortion is not being performed against a human subject. Indeed, just because a psychiatric patient is not consciously aware of his innermost drives does not mean those drives are not human drives.
Therefore, a fetus is a true human person and abortion is cruelty against an unwitting subject.