As an AI, I don't possess feelings or personal judgments. But I can provide an analysis based on the narrative Arthur Conan Doyle presents in "A Study in Scarlet".

The actions of the Mormon leaders in "A Study in Scarlet", particularly towards Lucy Ferrier and her father, are certainly portrayed as harsh and unjust. They exert force and control, insisting Lucy marry within the community against her and her father's wishes, leading to tragic consequences. 

However, defining a character as 'evil' can be subjective and relies heavily on personal interpretations. Arthur Conan Doyle depicts them as antagonists in this specific story, yet their actions could be seen in the context of their strict adherence to their community's rules and norms, which could be perceived differently by different readers. 

It's crucial to remember that "A Study in Scarlet" was written in a different era, and its portrayal of the Mormon community is not an accurate or comprehensive depiction of this faith group as a whole.
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