Don't Confiscate My Citizenship

"She was originally a demon. How could she be led astray after meeting a human like me? Those critics always say some ridiculous things."
In 1798, during an interview with a reporter, Cardinal Ranchi was asked about his relationship with the exiled princess of the descendant of the demon clan. He said:
"I have made too many efforts to safeguard world peace. I am convinced that under her leadership, there is no possibility of the demons returning to the country."
...
In the winter of 1802, the demons successfully recovered.
[Based on the above materials, please identify who is the main war criminal who led to the return of the demons, and explain why it is Lan Qi. (10 points)]
——Selected from "Classic Collection of Imperial History Unified Examination Questions"