The rule of three

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Across
  1. 2. for protection
  2. 4. we need
  3. 5. repair old cars
  4. 8. want food
  5. 11. people need med
  6. 12. are rare
  7. 13. are helping
  8. 15. can see above
  9. 18. to ambush
  10. 19. has weapons
  11. 20. are killing everyone
  12. 22. are important
Down
  1. 1. are not trusted
  2. 3. are worried
  3. 6. shocked
  4. 7. for survive
  5. 9. are old
  6. 10. are power
  7. 14. from destruction
  8. 16. are only hope
  9. 17. people
  10. 21. everywhere