He is not fit because he will not judge the crime rationally, but based on his own religious convictions, without observing the facts.
Although you haven't shown it, we can see that this question refers to the book "The Scarlet Letter."
We can reach this answer because:
It is important to remember that "The Scarlet Letter" tells the story of a woman who conceived a child outside of marriage and who lives in a puritan society, where she is harassed and seen as a criminal.
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