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The meliorist element has been the subject of much controversy , defended by thinkers such as Immanuel Kant who believed in human progress while suffering criticism by thinkers such as Jean-Jacques Rousseau , who instead believed that human attempts to improve themselves through social cooperation would fail .
 Immanuel Kant, Jean-Jacques Rousseau
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 Immanuel Kant, Jean-Jacques Rousseau