I will say this: SA is a deeply troubled country, but for once I think the ruling government has actually done a good thing by pursuing this.
https://www.reuters.com/article/idUSKBN2YY1E6/
SA does not really present itself as an earnest or true actor in the sphere oh human rights.
If Putin is arrested in a foreign country, you'll have the largest nuclear weapons arsenal in the world staring down at the very existence of that nation. No country would do this, however earnest they may be about human rights. Neither will it be fair to expect anyone to do this.