The narrator asks why the leftist intellectuals are so willing to march against Communism, when Communism is supposed to be the domain of the left?
When crimes of the Soviet Union became extreme, leftists had to decide whether to stop marching the Grand March, or reclassify the Soviet Union as an obstacle.
A leftist has to remain faithful to his own kitsch, above all.
The problem at this meeting in Bangkok is that the Americans were speaking the vocabulary of American kitsch, which has nothing to do with the kitsch of the Grand March. That's why there was so much misunderstanding and resentment between the different groups.