The only justification for repressive institutions is material and cultural deficit. But such institutions, at certain stages of history, perpetuate and produce such a deficit, and even threaten human survival.
The principle that human nature, in its psychological aspects, is nothing more than a product of history and given social relations removes all barriers to coercion and manipulation by the powerful.
The United States is unusual among the industrial democracies in the rigidity of the system of ideological control - "indoctrination," we might say - exercised through the mass media.
Unlimited economic growth has the marvelous quality of stilling discontent while maintaining privilege, a fact that has not gone unnoticed among liberal economists.
We can, for example, be fairly confident that either there will be a world without war or there won't be a world - at least, a world inhabited by creatures other than bacteria and beetles, with some scattering of others.