If any state broke from the norm there would be bombings, foreign backed insurgencies, financial embargoes, all of which prevent a functioning society from existing.

That was true for every side back then. Capitalism, Communism, even Islam. Iran was a pariah after they overthrew the Shah, and later found themselves at war with Iraq for 8 years, but they eventually survived.

Meanwhile, there where crypto-fascist countries who never got bombed or overthrown. Franco Spain & Nationalist Portugal lasted a long time after the Second World War. They only surrendering when the leader died from old age, or when the military budget grew too expensive and cutbacks were made.

Rhodesia however, was always screwed. They were completely landlocked and had to depend on Portugal to even get any supplies from overseas. South Africa however, at least tried to form a working alliance with other countries. Like Israel, ironically enough.