One of the dominant trends in recent STS studies is the discussions which try to capture the problems of science and technology in the context of civil society. They emphasize active oppositions towards the expert systems and autonomous decisions by the public people as a means to solve scientific issues. In these arguments, to express one's mistrust in experts is often considered as an important action, which is deferent from as has been the case in thepast. However, to mistrust in experts is never autonomous decision, but is equivalent to trust in experts when you see it as an individual action. When one needs to trust, he/she is stranger in the scientific confines : for example, whenone take an airplane, or when one has some food additives. Ordinary people rarely confirm the knowledge which is heard from the others or mass media. We often make decisions with trust in systems and being lack of any comprehensions. We invariably have to trust something unless we are like Robinson Crusoe. STS has often eliminated such as deficit model especially in the context of civil society. However, this paper reconsiders about the deficiency and tries to draw the attitude towardsscientific system in more realistic sense.