People have said Jeremy could not have committed the massacre as he had no history of violence.
It is true he had no history of violence, but he had recently committed a crime against his family, and had lots of hatred and resentment towards his family and the situation he found himself in. As discussed.
Inheritance killers are free men. Otherwise they would not be able to commit their inheritance killing. The other famous inheritance killers had no history of violent crime, apart from Defeo who apparently had fired a rifle in a rage before. However most had financial problems, committed minor crime and had poor relationships with their families, which usually included hatred and resentment.
Despite having respectable jobs and no history of violent crime, they took the huge jump to murder relatives for inheritance. There are several reasons why.
Each case is different, but there would be lots of other reasons, apart from inheriting. See the 'Steve Benson' & the 'Apart from £436,000....' threads. These reasons together with inheriting huge amounts of money would increase motivation.
The killer would know their intended victims. Know exactly when, where and how would be the most effective way to kill them. They will have constant access to the family members. Most victims would have known their assassin. The killer would feel comfortable in carrying out the crime on someone they know.
The killer would be desperate or greedy for money. Or both. Not being experienced violent criminals or Criminal masterminds, getting money via inheritance is their only option. They would know no other way, not having the courage to try to rob a bank for money, or have the mind to commit hi tec financial crime.
Not being big time criminals, they will then spend several months or years planning the crime and plucking up the courage.
Not having violent histories will go in their favour. The police will surely not suspect they would be capable of committing such a violent crime to loved family members. But if they did, the killer obviously believed the police would find no proof, the killer would also have a ready made alternative suspect.
Anyway it is a fact that people have murdered for inheritance. Both the Menendez brothers & Defeo admitting their crime. So the big jump is possible