Labeling pro-life policy as “speciesist” assumes that grounding rights in being human is an arbitrary preference, like favoring one animal over another for no reason. But the pro-life position can be framed in a way that avoids that charge altogether. The relevant grounding for rights is not mere biological labeling, but a higher-order capacity that flows from what an individual is by nature.
A higher-order capacity is an intrinsic potential rooted in the kind of being something is, even when that capacity cannot be exercised at a given moment. For example, a person may not currently speak Mandarin, yet still has the higher-order capacity to learn and speak it because of their underlying nature. That capacity is real even when it is undeveloped or blocked.
This same reasoning applies to moral agency. Human beings, by virtue of their nature, possess the higher-order capacity for moral agency: the ability to reflect, deliberate, judge actions as right or wrong, and choose accordingly. That capacity explains why adult humans are treated as persons in a way squirrels are not. Squirrels lack that kind of nature entirely; no amount of development would give them moral agency.
Crucially, this higher-order capacity is shared across all stages of human development. Human adults, newborns, embryos, and fetuses all belong to the same kind of being and therefore all possess the same intrinsic capacity for moral agency, even if they cannot yet exercise it. Differences in size, age, development, or current function do not negate the underlying capacity any more than temporary unconsciousness negates personhood.
On this account, pro-life policy is not speciesism. It does not say “humans matter because they are human” in a shallow or arbitrary way. It says that beings with a specific kind of nature—one that grounds moral agency—deserve moral protection, and that all humans share that nature equally from the beginning of their existence.
Key Takeaways
Basing rights on higher-order capacities avoids speciesism by grounding moral value in nature and intrinsic potential, not arbitrary group membership.
Human embryos and fetuses share the same higher-order capacity for moral agency as infants and adults, even when that capacity cannot yet be exercised.
Excluding humans from moral protection based on developmental stage would also undermine the rights of newborns and temporarily incapacitated adults.
Pro-life policy follows a consistent principle: all beings with the same moral nature deserve equal protection from being killed, regardless of age or ability.