Capitalism is more strongly correlated with freedom than inequality and prison. Think about what it was like before capitalism was around. Monarchs dictated everything. You did what you were assigned to do, which was pretty much what your parents and grandparents did. Capitalism allowed people to take risks and change their professions. The requirement to succeed was to provide something of value to others that they would buy from you. Those that provided more value were rewarded more. Sometimes capitalism can create incentives for a zero-sum game, but the vast majority of transactions are win/win with synergistic value creation.