Yamagami's hatred of the religious group increased after his mother donated more than 100 million yen ($720,000) to the Unification Church, according to a report by the Asahi Shimbun on Thursday.
The donation included 50 million yen the suspect's mother received from a life insurance policy on her husband, as well as proceeds from property sales, the Asahi Shimbun cited a source as saying. She was declared bankrupt in 2002.
That explains his hatred of the moonies. The cult convinced his mother to give every single penny she had including her husband life insurance policy and selling her property. Most likely the mother wouldn’t stop begging him for money to donate to the cult.