Question

who punished Cassio how and why?
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Answer 1

Answer:

Later in the play, Iago persuades Roderigo to assassinate Cassio, and together they arrange an ambush. Roderigo attacks Cassio by surprise. Cassio retaliates and mortally wounds Roderigo, but is himself stabbed from behind by Iago. His leg is wounded, but he survives.

Answer 2

He jumps very fast into conclusions that lead to a downfall. Iago poisons Othello's mind with lies about love, Desdemona, and his trusted lieutenant, Cassio and causes him to destroy them both. ... Being under pressure of Iago who controls him exploiting his weaknesses Othello ruins himself and people around him.