One of the most interesting aspects of the world we live in is the coupling between individuality and universality.
When we think in terms of materials in space-time, individuality seems to be absolute. On the other hand, if we think in terms of the platonic entities, individuality becomes suddenly relative. In physical space-time, the distance between two objects assures the individuality. On the other hand, in the abstract conceptual space, there is no such a thing as a physical distance that requires a finite time to be traveled.
This rather abstract reasoning becomes important when one considers the individuality of personal experience. Our strong belief that each of us is enshrined in a private world of experience comes from the fact that we are separated in terms of real physical space. However, when we consider the platonic space to which we have access through our experience, we might not be separated in that absolute sense. For example, when there are two identical histories of brain processes in spatially separated locations in the universe, the platonic world accessed through the resulting mentalities would be identical.
In terms of practical wisdom, we should regard ourselves as fellow travelers in the platonic world, accessing the same set of platonic entities (qualia), no matter how distant we are in terms of physical space. Thereon you can base your compassion and co-suffering with your fellow men.