Selfishness in this context is a balance between different forms of self-identification. e.g. national identity is a new invention designed to foster cooperation over previous bounds of identification. If it worked once, why not try it again...?
Lack of cooperation on Earth is a bloody affair for the constrained resources, so an intergalactic campaign under the same assumption may lead to advanced alien cognition desiring to expand our sense of self. I.e. if multiple timelike dimensions exist then our survival mechanism is maladapted to that topology. If you discover this constraint expansion on your own, it is freedom. If you are told, it is subjugation. ...or so I muse.
Lack of cooperation on Earth is a bloody affair for the constrained resources, so an intergalactic campaign under the same assumption may lead to advanced alien cognition desiring to expand our sense of self. I.e. if multiple timelike dimensions exist then our survival mechanism is maladapted to that topology. If you discover this constraint expansion on your own, it is freedom. If you are told, it is subjugation. ...or so I muse.