Theseus did not think Hercules was guilty of murder because Hercules was temporarily insane.
According to the legend of Hercules, he was a powerful warrior that was half-god, half-man that protected his earthly family and people from their enemies.
However, he was unfortunate to incur the wrath of the goddess Hera who turned her anger on Hercules and made him insane so that he killed his beautiful wife and five children.
He spent a great deal of time trying to atone for these sins by performing various tasks.
As a result of these events and his remorse, Theseus did not think that Hercules was guilty of murder.
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