The structural crisis in politics

In recent times, not only the US but also other western democracies can be described as "two-rightwing-party-systems" or in practice as one-party-systems – monopolising political decision making by an institutional structure based on self-legitimising consensus. What are the social grounds and structural reasons that develop the negative tendencies in politics and justice – putting away political liberties, because they cause only trouble? The spoor leads to the structural crisis of the capitalist way of social reproduction.