People who use an actions/outcome based evaluation of good/evil aren't really looking at things at a conceptual level.
I will reference Tales of Berseria, again. The team is composed of a group fighting for "chaos" because "order" has decided that the individual will must be eliminated for there to be peace and lasting order.
Thus, the "demons" are the good guys. They choose, of their own free will, to associate with each other, to support each other, and to save the world. It is a selfish desire to do something for another person that drives them. Or… The selfish desire for revenge that drives them to blow up a port.
Ultimately - the good vs evil divide, I argue, rests on whether one values others in the world, or whether one considers them subservient to their own desired ends. That is something which holds true regardless of how the world works or what the objective of our instance of existence is.
A good person in an online game values the others in the game. An evil person does not. How that manifests depends on the game… Or the situation in the real world, but seems fairly universal.