I was thinking at the weekend about Ralph McTell's song Streets Of London, with all those verses of sad London lives and the chorus, 'So how can you tell me you're lonely, and say for you that the sun don't shine? Let me take you by the hand and lead you through the streets of London: I'll show you something that'll make you change your mind.'
That wouldn't work for any normal person. We are all aware of individuals or groups of people, near or far, worse off than we are, but it doesn't stop us feeling lonely or sad. If anything, thinking about them will make us even sadder. Oh Ralph, I fear your labours were in vain.