Don't confiscate my citizenship

"She was originally a demon. How could she be corrupted after meeting a human like me? Those critics always say some ridiculous things."
In 1798, Cardinal Lanci was interviewed by a reporter and asked about his past with the exiled princess of the last demon clan and the recent signs of the demon clan's revival. He said:
"I have made so many efforts to safeguard world peace. I am sure that the demons will never be able to restore their country under her leadership."
……
In the winter of 1802, the demons successfully restored their country.
[Based on the above information, please point out who is the main war criminal who led to the restoration of the demon clan, and explain why it is Lanqi. (10 points)]
——Selected from "Classic Test Questions of Imperial History Unified Examination"