Rok, you seem to have a very faulty memory when it comes to race and the south in the 50's. Do you remember what happened to Emmett Till for "Reckless eyeballing" in Money, MS when he was 14? While you're learning about Mingus's music, you have very little knowledge about Mingus the person; he held his tongue for no one, and if he had gone south, everyone knew that he would have come back in a pinebox.
Enjoy the music.