Hobbes, Locke, and Rousseau all misunderstand human nature. Neurological evidence, genetic evidence, archeological evidence, anthropological evidence, and so on... are all basically converging on the idea that humans are inherently neutral (neither good nor evil, but having the potential for both), rather what we are is creative and adaptable, and if we live in conditions that foster cooperation people become more cooperative, and if we live in conditions that foster competition or selfishness people become more competitive and selfish. The interesting thing is that while we are shaped by our societies, we also shape the societies themselves, it is a positive feedback loop.