Morality can be involved in strategy to survive. First and foremost, morality is just specific behavioural patterns. Behavioural patterns can be encoded in DNA, e.g you could have a genetic variation that leads you to feel maximally rewarded when you fight back after some slight on your character.

Then you might wonder, "why does/doesn't every member of the species have that variation?". A suitable answer as I have come to understand is, it depends on whether it is evolutionary stable for every one to have the variation or not have it. Plus you can expect some error margins.

For example, while every one can farm, every one can't be pillaging, a society of all pillagers cannot be stable. You can also see that in a society of all farmers, a randomly introduced pillager will have a blast while not necessarily upsetting the balance. But start introducing more pillagers and the stability will break down at some ratio of pillagers to farmers.

Please note that this is not "selecting what is good for the species", that is only a consequence.