Chiang did not consider this a good reason to suspect Guo and became enraged when Du presented his view because Chiang believed it implied that all of the Nationalists were corrupt, and that only the Communists were clean.
Chiang did not consider this a good reason. This was to suspect Guo. Chiang became enraged. Du presented his view. It implied that all of the Nationalists were corrupt, and that only the Communists were clean. This was what Chiang believed.