Utilitarian philosophy has been popular since ancient times, especially today. Is this correct?

You seldom involve this problem, but the so-called "utilitarian philosophy has been popular since ancient times" is incorrect. Although utilitarianism can be traced back to Epicurus from ancient times, it was maintained by Hull in modern times, and Bentham and Mill in modern times. However, utilitarianism did not occupy the mainstream in history, and even often became the object of suppression by mainstream concepts. Modern utilitarianism replaced traditional liberalism (social contract theory) and became the legal basis of capitalist society.

There are many views on why modern utilitarianism can occupy the mainstream; As far as realistic history is concerned, it is due to the decline of traditional liberalism and Marx's attack on capitalism. Originally, the legitimacy of capitalist countries was based on the social contract theory, which believed that the government was formed through the people's contract and represented the interests of all citizens. However, in the19th century, the rise of the workers' movement and the emergence of Marxism revealed that capitalist countries serve capitalists, not all citizens, thus subverting the legitimacy foundation of capitalism. However, through the decline of traditional liberalism, modern utilitarianism, which is similar to socialism and productism in economic theory and political inclination, came to power. It openly admits that the foundation of capitalist countries is not freedom and equality, but interests (when capitalism itself admits to serving interests, the threat of Marxism actually weakens a lot, because Marxism itself believes that economic development, that is, the interests of the whole people, is the standard for measuring social systems, which is different from utilitarianism. In this way, workers will no longer pursue freedom and equality, but pursue interests like capitalists (who doesn't want a better life).

As a result, utilitarianism has become the theoretical basis of contemporary capitalist countries and has spread rapidly to every corner of the earth. Due to the reform and opening up, we quickly accepted this concept. Speaking of correctness, philosophers' criticism and counter-criticism of utilitarianism have been arguing endlessly since the last century, but so far they have not touched the stable position of utilitarianism.