The only reason why organics function is for selfish benefit

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That's completely an illogical standpoint, all decisions factually cause an emotional response and/or a physical response...

That doesn't demonstrate that said response is rewarding to the individual.

Are instinctive behaviours rewarding in other animals - lions for example? How far does it go? Does the termite feel reward for following the pheromone instuctions of its queen?

Now if you were to show that the serotonin levels (or equivalent) in the brains of the Orca's concerned rose when they were feeding Stumpy you'd have something.

Right now we have multiple individuals from multiple pods working one day at a time to keep Stumpy alive and we don't know why. It looks like altruism is all we can say.