There are three general types of such cases, one is that there was a previous psychological illness but did not seek medical treatment, the other is that the cause of the previous illness was hidden, so no one found out that there was a problem with the psychological aspect, and the third is the most serious one, that is, it was put under a psychological suggestion, or it was stimulated by something all of a sudden.

　　Otherwise a person wouldn't make such an overly aggressive move ...