Why Do Swordsmith Villagers Wear Masks in 'Demon Slayer?

For a very crucial reason.

Why does Haganezuka wear that mask in demon slayer (sword Smith arc)? - Quora

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Demon Slayer -Kimetsu no Yaiba- Swordsmith Village Arc, Upper Rank 6 G

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Reasons To Be Excited For Demon Slayer's Swordsmith Village Arc

Swordsmith Village Arc Pt. 1, Her Eyes (Demon Slayer Various x Fem!Gojo Reader)

Why do the swordsmiths in Demon Slayer wear the special masks of Hyottoko?

Demon Slayer are fans shook by how hot unmasked Haganezuka is

Demon Slayer Season 3