Why does the doctor say that rim is their ally from treasure island

The doctors say that rum is their best ally on Treasure Island because pirates live on rum. The drink is thus associated with the wild lawlessness of piracy. The doctor implies that rum and the climate prove to be an advantage to the heroes, which don't drink rum, as both of them lead to tactical errors. The heroes can capitalize on the drunken pirates' mistakes.

a dictionary is the correct answer

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