Why in the 19th c. did radical teachings find an increasing response in society, and utopian teachings turned out to be untenable?

By the middle of the 19th century, utopian teachings finally showed their inconsistency and non-life. They were replaced by radical teachings calling for a violent reorganization of society. At the same time, the authorities of a number of countries, advanced social forces gave preference to peaceful evolutionary development. The incompatibility of these two paths led to the opposition of forces in society. Later, already in the XX century, this more than once led to tragic consequences.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.