Influence of socialist ideology: In many countries, socialist ideology was in a dominant position during this period, emphasizing collectivism, unity and mutual assistance. This view holds that individual happiness and success are closely related to collective happiness, so people are encouraged to help, support and care for each other.
Post-war reconstruction: After World War II, many countries have gone through the stage of reconstruction, and the society needs to unite to overcome the post-war destruction and challenges. In this case, people are more inclined to cooperate with each other to rebuild society and economy together.
Cultural and media influences: The 1960s and 1990s were the periods when the TV and film industries rose, and a large number of media contents emphasized the emotional communication and interaction between people. This influence makes making friends and heart-to-heart become a universal social value.
Economic prosperity and stability: in some countries, this period has experienced a relatively stable and prosperous economic period, with the improvement of people's living standards and the improvement of social welfare system. In this case, it is easier to encourage people to care and help each other.
Oppose war and violence: In the 1960s and 1990s, many social movements opposed to war and violence took place all over the world, and people generally longed for peace and harmony, which also prompted people to attach importance to friendship, care and support each other.
To sum up, the mainstream social concept in the 1960s and 1990s emphasized the social concept of making friends and caring for each other, which was shaped by the social background, cultural influence and economic situation at that time.