Because: - humans can ask back questions to clarify any ambiguity; computers don't have the capacity to understand ambiguity, let alone asking for clarificatio

Because: - humans can ask back questions to clarify any ambiguity; computers don't have the capacity to understand ambiguity, let alone asking for clarification. - computers are trusted to work w/o failure almost 100% of the time. humans err (to be human is to err, anyway), so we'd never put a human in charge of critical things we use computers for.