How does the Home Office deal with a mixed Indian-Pakistani couple where neither can get a visa for the other’s country? Should they be allowed remain in the UK together?

How does the Home Office deal with a mixed Indian-Pakistani couple where neither can get a visa for the other’s country? Should they be allowed remain in the UK together?
Gambling is an evil habit. A gambler loses control of his senses and continues to bet until he loses all his money. But even then