What does the song he ain't heavy he's my brother mean?

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Tags

1. #place
2. #magazine
3. #looking
4. #nebraska
5. #heavy
6. #omaha
7. #flanagan
8. #messenger
9. #brother
10. #where
11. #father
12. #located
13. #drawing
14. #homeless
15. #younger
16. #across
17. #could
18. #caption
19. #carrying
20. #called
21. #troubled