Whether the Mormon leader in "A Study in Scarlet" is evil is a matter of opinion. The novel does not explicitly state that he is evil, but his actions are certainly immoral and unethical.

He forces Lucy Ferrier into a marriage against her will, and he may have also poisoned her father. These actions are cruel and selfish, and they have devastating consequences for Lucy and her family.

However, it is important to note that the novel is set in the 19th century, and the Mormon religion was very different at that time. The Mormon leadership was much more authoritarian, and they had a great deal of control over the lives of their members.

It is possible that the Mormon leader in the novel was simply following the customs of his religion at the time. However, his actions are still wrong, even if they were motivated by religious beliefs.

Ultimately, whether or not the Mormon leader in "A Study in Scarlet" is evil is a matter of personal interpretation. The novel does not provide a definitive answer.
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