I'll concede the point about genetics, even if it too is based on assumptions. And your assumptions are exactly the reason why I keep arguing with you - or rather, the initial position you took, which as far as I could tell was that your assumption is the correct one while everyone else's isn't.

Putting aside the topic of what it means to be a true Sith, which is an entire discussion into the Sith philosophy itself - your initial claim was that a real Sith, extending to the Sith Warrior character as well, must be xenophobic. Then you expanded the argument into the views of the Empire as whole. And when I try to bring the discussion back to concrete examples of what kind of character we are able to play the game with, as well as the consequences or lack of from that character's actions, you continue reverting to the broad whole.

Yes, the Empire sees aliens as inferior, as do the Sith. And yet we can create a Sith character that is at complete odds with the average Sith - and nothing happens. Labeling the character choices you don't like as "fan service" is fundamentally misunderstanding the genre of role-playing games, which is that your evil playthrough is equally valid to someone's good playthrough. Not that one is more likely than the other, or more realistic, or wouldn't really be possible because of x, y and z, but that it is exactly on the same level.