Other than the absolute legal requirement for conviction, why is it so important in a jury trial for prosecutors to carefully show the Mens Rea elements of a crime?

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Mens Rea, which refers to the intent or knowledge of wrongdoing, is important in a jury trial because it drives the juror or judicial thinking as the ultimate issue as guilt or innocence is evaluated. It helps jurors understand the defendant's mental state and whether they had the necessary intent to commit the crime. Without proving Mens Rea, a conviction may be difficult to obtain. For this reason, prosecutors need to carefully show the Mens Rea elements of a crime.

Other Than the Absolute Legal Requirement for Conviction, Why Is