4. And this is just straight-up
you not doing your homework. Slavery isn't stamped out in the outer rim because the Republic never wanted the expense of keeping it gone, and its far less public and more run by gangs the closer you get to the core because, as linked, people in the Core not part of the human supremacy movement kinda think slavery is messed up. Heck, the fact the Republic's control over the galaxy loosening is what prompts the Zygerrians trying to turn their covert operations public and massively expand it.