The Book and the Sword is written from the Han point of view so the Red Flower rebels are portrayed as "heros" while Emperor Qianlong is portrayed as a traitor to his own kind, but in actuality, the true villains of the story are the Red Flower Society buffoons.
They want to overthrow the Manchu government not because of any compassion for the masses or any wish to better the world. The reason they were willing to create chaos and cause the deaths of millions was one of bigotry, they did not want to be ruled by whom they considered "foreigners" or "barbarians." Under Qianlong's reign, China overall was a land of prosperity, people were living decently comfortable lives (as comfortable as peasants in Imperial China can ever expect), there was absolutely no need for revolt.
The RF Buffoons fool themselves and lie to everyone about being about righteousness and honor. Judging from Chief Buffoon Chan Ga Lok's willingness to sacrifice the life of an innocent girl who was neither Manchu or Han to achieve his purpose of manipulating his own brother into turning on the government, it is quite clear that these guys are hypocrites.
That is not to say the Qianlong character in the story is not a piece of donkey dung in his own right, but at least he does not pretend to be a man of honor.
That's why I always root for Qianlong to obliterate the Red Flower Society and execute CGL via the 5-Horse-pull-Body-Separation method.