You cannot act as judge, jury and executioner in this argument.
judge, jury and executioner
idiomSomeone with the roles of judge, jury and executioner; someone with full power to judge and punish others unilaterally.
The manager acted as judge, jury and executioner when he fired the employee without hearing his side of the story.
By unilaterally deciding the fate of his subordinates without any oversight, the director effectively became the judge, jury and executioner of the department.
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Barnaby Rudge
[Cockney slang]judge
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judge a book by its cover
To make judgments about things or people by considering external appearances alone.
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jury is out
An outcome or decision is still unknown and awaited.
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tell it to the judge
I do not believe what you said.
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you can't judge a book by its cover
It is not possible to make reliable judgments about things or people by considering external appearances alone.