why does othello ignore the cries for help?

Othello is hurdling towards self-destruction: sadly, by the deaths of people closest to him. Like tragic heroes such as Macbeth, Othello's senses are dull to tragedy and screams of terror. Roderigo and Cassio fight, and both are injured; Othello hears the scuffle, is pleased, and then leaves to finish off Desdemona.