Why did the guy kill his family?

It could be due to a severe mental breakdown or some extreme stress that pushed him over the edge.

Well, there could be various reasons. Maybe there was a deep-seated family conflict that escalated beyond control, or Jeffrey might have been influenced by external factors like drugs or a traumatic event.

Perhaps he was influenced by external factors like drugs or had a history of violence that culminated in this horrifying act. Or maybe it was a sudden, irrational outburst that he later regretted.

In the novel," Celebrating Years," Sigu Jian killed his entire family because he wanted to break free from the fate of his family and take responsibility for his own life. Sigu Jian was the master of the Sword Hut, the guardian of Dongyi. His sword skills were superb and he was known as the " number one sword in the world." However, his family had always been regarded as the guardians of Dongyi. Their destiny was to fight for Dongyi and sacrifice for it. Sigu Jian was unwilling to accept this fate. He wanted to pursue his own life. He believed that only by killing his family could he completely break free from the shackles of his family and take responsibility for his own life. Thus, in the novel, Sigu Jian killed his parents, brothers, and wife. Then he left Dongyi and began his wandering life. His actions caused shock and anger in Dongyi, but he did not care. He believed that his choice was correct.

The girl killing the guy because of his cheating could be a result of intense emotions like hurt, anger, and a sense of justice gone wrong. It might also indicate that she had a possessive or unstable personality.

It could be that the Moore was mentally unstable or influenced by external factors that led him to commit such a horrifying act. There might have been financial problems, jealousy, or a history of abuse that culminated in this tragic event.

It's hard to say for sure. Maybe he was mentally unstable or under extreme stress and made a tragic and irrational decision.

It's likely that Merricat's actions were driven by a combination of factors such as her own mental instability, past traumas, and a desire for independence. Her family dynamics might have pushed her to this extreme act.

Hard to tell exactly. It might have been a case of temporary insanity, or maybe the son did something that the father perceived as unforgivable. We'd need more context to understand this awful event.

I don't know which novel or fictional character 'psychic detective Yamunaka' refers to, so I can't provide an accurate answer. If you can provide more context or point out which work you are referring to, I will try my best to answer.