This article deals with the problem of relationships among people in the future, which are based not on respect and understanding of each other's value, but on absolute dependence on technical progress. The purpose of this work is to highlight the problem of humanity’s tragedy in the genre of science fiction, using the example of Ray Bradbury’s works „Tomorrow's Child” and „The Veldt”. Firstly, it is noted that the difference and, accordingly, the problem begins immediately with terminology, because there is no single stable definition of the term „fantasy” (as a generic phenomenon) in English-language science. The options offered by scientists are speculative fiction, fantastic fiction, fantasy literature. The author notes that science fiction (Sci-Fi) describes many different super important problems of the human society: technological progress, information wars, the desire of people to be immortal, powerful, rich, possessing the Universe. In fact, the tragedy of humanity begins from these desires. However, R. Bradbury’s works „Tomorrow's Child” and „The Veldt” have a wide range of topics, affecting aesthetic, intellectual, moral and scientific problems. In addition, the science fiction writer reveals his special interest in the inner world of the child. In the mentioned-above stories, the idea of the coexistence of people and the techno world is traced, which leads to a tragic situation. Covering the problem of humanity’s tragedy in the future, described back in the distant 1950s, R. Bradbury aims to present another idea of the future, he describes, at the same time, possible threats to us, and shows what significant consequences this can lead to.