Are knife sharpeners bad for knives?

Related questions

1. Is Zwilling the same as Henckels?
2. What's the difference between Henckels and Henckels International?
3. Are JA Henckels good knives?
4. Are Henckels knives good?
5. Where are Wusthof knives made?
6. Is Henckels a good knife brand?
7. Do you hone or sharpen first?
8. Where are Zwilling pans made?
9. Are JA Henckels International knives good?
10. Are Henckels International knives good?

Tags

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2. #metal
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6. #harsh
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8. #knives
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11. #indicating
12. #sparks
13. #overheated
14. #remove
15. #knife
16. #electric
17. #gouge
18. #produce
19. #cannot
20. #strong
21. #these
22. #symmetrical