Freedom of Speech Justifiably Limited

Under what parameters, if ever, is freedom of speech justifiably limited? Is there a clear distinction between freedom fighting and terrorism? Is it morally permissible--or perhaps even obligatory--to criticize another culture's practices if we find those practices morally reprehensible? Are we morally obligated to consider future generations when determining what to do right now? Is it morally permissible for physicians to assist in a suicide?            

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