Sorry OP your opinions aside, the books all have cases were a race thought to be Empire or Republic defects. There are some Pure blood Sith that defected and of course there are some Chiss, which btw in this time period were no where near as "equal" to humans or pure bloods.
Also: Consider for a second that the Empire is massive and not always fair to its citizens, and or Sith are very cunning, training to be a Jedi gives them some insight into their enemy.
I do hear what you are saying, I do partially agree, but mostly because I always roll a human and I'm not going to get much out of this feature.