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If ithey find it immoral in the sense of crossing a line that should never be crossed, then they are not going to play. I don't think the morals=values theory can tell you where the bright lines are, and that is why I think rules and a few other things are involved in ethics.
Consider a harder case....a society that is ruthless in crushing any society that offers any rivalry or opposition to them, but otherwise leaves people alone. Since that is a survival promoting strategy, you can't argue that it would just be selected out. But it doesn't seem as ethical as more conciliatory approaches.
"It doesn't seem as ethical as more conciliatory approaches." I agree. That is because it is not the best strategy. It may not be the worst possible strategy, but it is not the best. And since the people engaging in that strategy, their ability to think about it, over time, will lead them to adopt better strategies, namely more conciliatory approaches.
I don't say that the good is achieved by selection alone. It is also achieved by the use of reason, by things that use reason.