Rousseau held that society corrupts inherently good human nature

Evidence

Jean Jacques Rousseau (1712–1778) argued, against Hobbes, that human nature was essentially good. Rousseau maintained that if man were left to his natural state he would be able to achieve inner harmony and positive relationships with other human beings and with nature. According to this perspective, man’s inherent virtue is compromised through socialization and the demands of society. — John T. Jost and Jim Sidanius, Political Psychology, 97