The more I read on this holy text, the more I have strong conviction that this holy text is especially written for this time. In the “Wrong Assertions” chapter, it has addressed and given us valid and logical reasoning that the claim of saying that Dorje Shugden is a demon has no basics.
Dorje Shugden is from the reincarnation lineage of great beings that include mahasiddha Birwapa, the great Kashmiri pandit Shakya Shri, the omniscient Buton, Dultzin Dragpa Gyaltsen, Panchen Sonam Dragpa, and so forth. They were all fully enlightened beings, so would definitely do not have bad karma to be reborn in the preta realm?
These holy beings are fully enlightened and attained high states of realization and would have pure ethical discipline. How would they create any bad karma that can cause the negative throwing karma to be reborn into lower realm as preta? If we believe they will reborn into lower realm, then it can cause us from not believing the Buddha teaching and may think that all the good actions or ethic practice could be wasted. If we believe these holy beings can be degenerated and rebirth into lower realms, then we might also feel that high beings worthless right? Therefore, it is not possible for them to be in preta form through the force of negative karma. The only reason that is possible is that they choose to emanate in that form as they are compassion enough to help others or for a special purposes.
Therefore, Dorje Shugden is truly Manjushri that emanate in wrathful protector form in order to help others.