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Among the non-utilitarian philosophers , Michael Walzer argued that terrorism can be morally justified in only one specific case : when " a nation or community faces the extreme threat of complete destruction and the only way it can preserve itself is by intentionally targeting non-combatants , then it is morally entitled to do so " .
 Michael Walzer
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Text: {0} 
Answer:
 Michael Walzer