"Rhodesia was a good country and they didn't oppress anyone with apartheid laws."
This is no defense of Mugabe or Rhodesia, but how much freedom did the average person have in Rhodesia. Could they vote? Go to school? Live where they wanted?
Rhodesia might not have had the apartheid system of SA, but it was still a highly segregated place, and most of that segregation was backed up by laws.
http://www.geocities.com/Chilenationalist/rhodesia.html
In terms of what was going on next door, Rhodesia was a far better option for a black African. That's just how it was back then. Personally, if I was black and educated in that time I would have simply left (which many did and perhaps that's why southern Africa is in the state that it is in).