All things equal. Specie A (with this disease) stop cannibalizing after seeing the outcome, better chance of survival. Specie B (without this disease) eat the

All things equal. Specie A (with this disease) stop cannibalizing after seeing the outcome, better chance of survival. Specie B (without this disease) eat themselves to the last person... Lower chance of survival as a specie. Nature "cares" by generating lots of options, then let the fittest to survive. So while nature doesn't intend or plan for a specie to survive, the outcome is no different from if it did. I believe the OP means "care" in this sense.