Sylogism for Objective Morality:
1. Action presupposes reasons -> To act intentionally is to take oneself to have reasons for acting.
2. Reasons must be universalizable -> A reason counts as rational only if it could justify action for any relevantly similar agent, not merely because it is "my" preference.
3. Agency is the capacity to recognize and act on reasons ->
Agents are beings capable of understanding and acting for reasons. This capacity exists in varying degrees, including developing or partial forms.
4. Agency requires objective conditions -> To act for reasons, agents require certain generic goods: Life, bodily integrity, minimal freedom, and cognitive functioning. Without these conditions, agency is impossible.
5. Therefore every agent must value these conditions because these goods are necessary for any action at all, every agent must regard them as necessary for their own agency.
6. Denying them to others is arbitrary -> If an agent claims these goods are necessary for themselves but not for others, the justification becomes identity-based ("because it’s me"), which is not a rationally generalizable reason.
7. Therefore rational agents must recognize the agency of others -> Consistency requires recognizing that the same conditions that justify protecting one's own agency apply to other agents and developing agents as well.
8. Violating those conditions without justification frustrates agency -> Actions like killing, coercion, or torture unjustifiably destroy the preconditions that make agency possible.
9. A norm is objective if denying it requires a performative contradiction -> If one must rely on the agency the norm protects in order to reject it, the norm holds independently of personal preference.
Conclusion:
Unjustified destruction or frustration of agency is objectively wrong, because any rational agent must recognize and preserve the conditions that make agency possible.