It has been argued within the novels by opponents of the Culture that the role of humans in the Culture is nothing more than that of pets, or parasites on Culture Minds, and that they can have nothing genuinely useful to contribute to a society where science is close to omniscient about the physical universe, where every ailment has been cured, and where every thought can be read. Many of the Culture novels in fact contain characters (from within or without the Culture) wondering how far-reaching the Minds' dominance of the Culture is, and how much of the democratic process within it might in fact be a sham: subtly but very powerfully influenced by the Minds in much the same ways Contact and Special Circumstances influence other societies. Also, except for some mentions about a vote over the Idiran-Culture War, and the existence of a very small number of 'Referrers' (humans of especially acute reasoning), few biological entities are ever described as being involved in any high-level decisions.

On the other hand, the Culture can be seen as fundamentally hedonistic (one of the main objectives for any being, including Minds, is to have fun) rather than to be 'useful'. Also, Minds are constructed, by convention, to care for and value human beings. While a General Contact Unit (GCU) does not strictly need a crew (and could construct artificial avatars when it did), a real human crew adds richness to its existence, and offers distraction during otherwise dull periods. In Consider Phlebas it is noted that Minds still find humans fascinating, especially their odd ability to sometimes achieve similarly advanced reasoning as their much more complex machine brains.

To a large degree, the freedoms enjoyed by humans in the Culture are only available because Minds choose to provide them. Nevertheless, social convention within the community of Minds seem to make it impossible, as well as abhorrent, that these freedoms should be curtailed in a society that cares about the happiness of its members.^{[citation needed]} The freedoms include the ability to leave the Culture when desired, often forming new associated but separate societies with Culture ships and Minds, most notably the Zetetic Elench and the ultra-pacifist and non-interventionist Peace Faction.