Instead of looking at good & evil, which is just moralistic nonsense, and at that, totally irrelevant esp. if alien cultures & races are added to such a hypothetical situation, it would be more informative to determine if a co-existance can be established if Races (or Players) do make choices that are either cooperative or exploitative.
The best reason for being cooperative is that, as a whole, it will net the most profit (monetary or otherwise). Its ultimate goal is to create a scenario in which all other players are cooperative as well.
The reason for being exploitative is that it will net the highest profit individually if someone can be found that is exploitable, at the expense of this victim. Its ultimate goal is to subdue everyone else, however, once achieved, the exploitative nature doesn't cease but simply manifest on another plane (tyranny, exploiting its own kind)
One way to evade this victimization for cooperative players is to NOT cooperate with exploitive players. In a scenario where cooperative players cooperate with each other but ignore exploitative players - which are then isolated and on their own, finding noone to cooperate or to exploit, these grow weak and will naturally become extinct in an evolutionairy extent. (the same can be said from factions that generally refuse to cooperate with anyone)
The other way is to emulate the same ways or ultimately, use the same aggressive methods as the diametral faction of rule. The danger in this is that ccoperative players can mature into becoming truely exploitative as well.
The general attitude of cooperation actually & initially opens the door for the exploitative approach, in that it can be hidden or the victim be deceived or other strategies used in order to make other factions to agree to bad deals. It's also interesting to note that all players can be of both attitudes at the same time, but usually not to the same partners.
