Human relations with large systems are discussed as a special group of safety problems. The dangers here are impalpable, that is, not perceived sensually. Human security systems formed in evolution do not react to them properly. To understand the dangers of large systems, a person needs intermediaries and interpreters. The development of the global network has increased the influence of intermediaries. At the same time, their competence and decency are no longer guaranteed. Each person has to choose a source of information and decide whether to believe his messages. Our observations show that people are not up to the task. Their consciousness is being actively manipulated. The problem of finding a way to persons rationally decision making in the world of information chaos is discussed.