When we use a tool in everyday life, it usually remains a detached instrument under my control and activated only when, where, and how I decide. … In… - Raymond Geuss

In some central and important cases, … the existence of specific power relations in the society will produce an appearance of a particular kind. Certain features of the society that are merely local and contingent, and maintained in existence only by the continual exercise of power, will come to seem as if they were universal, necessary, invariant, or natural features of all forms of human social life, or as if they arose spontaneously and uncoercedly by free human action.

If the basic assumption of the theory of ideology is at all tenable, namely, that the general power relations embodied in our social structures can exert a distorting influence on the formation of our beliefs and preferences without our being aware of it, then we are definitely not going to put that kind of influence out of action by asking the agents in the society to imagine that they didn’t know their position. To think otherwise is to believe in magic: imagine you are “impartial” and you will be. In fact, doing that will be more likely to reinforce the power of these entrenched prejudices because it will explicitly present them as universal, warranted by reason, etc.

Diverting attention from the way in which certain beliefs, desires, attitudes, or values are the result of particular power relations, then, can be a sophisticated way of contributing to the maintenance of an ideology, and one that will be relatively immune to normal forms of empirical refutation. If I claim (falsely) that all human societies, or all human societies at a certain level of economic development, have a free market in health services, that is a claim that can be demonstrated to be false. On the other hand, if I focus your attention in a very intense way on the various different tariffs and pricing schema that doctors or hospitals or drug companies impose for their products and services, and if I become morally outraged by “excessive” costs some drug companies charge, discussing at great length the relative rates of profit in different sectors of the economy, and pressing the moral claims of patients, it is not at all obvious that anything I say may be straightforwardly “false”; after all, who knows what “excessive” means? However, by proceeding in this way I might well focus your attention on narrow issues of “just” pricing, turning it away from more pressing issues about the acceptance in some societies of the very existence of a free market for drugs and medical services. One can even argue that the more outraged I become about the excessive price, the more I obscure the underlying issue. One way, then, in which a political philosophy can be ideological is by presenting a relatively marginal issue as if it were central and essential.