Why Does Wild Animal Suffering Matter?
This line of reasoning explains why the suffering of all sentient individuals should be given ethical consideration.
Premise 1: Non-human animals have a capacity to suffer.
Premise 2: Suffering is undesirable for an individual.
Premise 3: If an animal suffering on a farm is a moral concern, it must be morally concerning because of the suffering, not because of the moral agency of any of the actors.
Premise 4: Animals in the wild suffer too, and often to a large degree (because of natural disasters, parasitism, disease, starvation and predation).
Premise 5: If individual animals suffer in the wild, then that must be a moral concern regardless of the agency of any of the actors.
Conclusion: Wild animal suffering is a moral concern, and maybe even a larger concern than factory farming because of the scale of suffering.