Why is it said that World War I made Chinese people doubt the capitalist national salvation plan?

World War I (referred to as World War I, August 1914-November 1918)"; after the end of "World War I", China, as one of the victorious countries, put forward reasonable proposals at the Paris Peace Conference The request was rejected, and the news spread back to the country; the angry Chinese people triggered the May Fourth Patriotic Movement. The Japanese government, which got a good deal afterwards, laughed at China and said, "China, as a victorious country, is worse than a defeated country."