I guess it's the best they can do, at least at this time.
A declining gene pool due to isolation leads to inbreeding-and the extinction of species from low fertility/birth rates time after time-maybe the fertilization of the southern white rino eggs by adding northern white rino sperm will increase that gene pool and allow the species to recover-that type of fertilization has been done successfully with cheetahs in areas where terrain, park borders, etc limit their travel to find un-related mates-and their numbers are increasing-maybe it will work for the rinos, too...