An old socialist buddy of mine genuinely believes that genetics plays basically no role in human behaviour and intelligence. Which is problematic because if you believe everything about humans is based on societal influence then it makes utopia seem plausible. By manipulating society you can shape individuals. If you shape individuals you can get them to work towards building your utopian future. But then they don't realise why this utopia isn't coming about because they've completely disregarded the most important factor about humans, the inherent traits developed from millions of years of evolution. Which is orders of magnitude more influential on human behaviour than society.