If Escalus is more suitable for the position, why does Vincentio appoint Angelo as the deputy?

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…justice, but because he is a hypocrite and a scumbag. Angelo slept with a woman while he was betrothed and he tries to trick Isabella into sleeping with him. This is very ironical because it proves that the evidence is overwhelming as to why Vincentio choose Angelo over Escalus. Maybe Vincentio wanted to make Angelo the deputy to show him how cold-hearted he is and that he is the wrong authority to watch over Venice.