Why Doma is labeled as the worst demon in Demon Slayer

In Demon Slayer: Kimetsu no Yaiba, Doma asserts his dominance at the Upper Rank Two position in the hierarchy of 12 Demon Moons.

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I don't understand why people say that douma is pure evil demon : r/KimetsuNoYaiba

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I don't understand why people say that douma is pure evil demon : r/KimetsuNoYaiba

Made a Tier List ranking how evil/disturbing the demons are imo after watching a post that talked about the 'real villains' of KMY : r/KimetsuNoYaiba