Rosie Batty says killer dad Greg Anderson was mad, not bad, and no one is to blame for the death of her son.
Ms Batty says Anderson was mentally ill when he murdered their son, Luke Batty, in February as they played together in the cricket nets at the Tyabb oval.
But she lamented the lack of intervention from government agencies as his behaviour escalated in the months before the attack on Luke.
“Greg was mentally ill. I have known him for 20 years and I didn’t have the power or capacity to have agencies intervene on his behalf,” she said.
“He was mad, not bad.”
Ms Batty told the Victorian Coroner’s Court that serious flaws existed in the state’s justice system.
She said perpetrators were protected and victims of family violence were not properly included in the risk assessment of dangerous men, such as Anderson.
“I didn’t know people were making assessments of my safety without even engaging with me,” she said.
The penultimate day of evidence in the three-week inquest into Luke’s death concluded with a photo montage of the 11-year-old set to the Louis Armstrong song What a Wonderful World.
Ms Batty ended proceedings by reminding the court her son was more than just a tragic statistic.
“He was a person and this should never have happened to him,” she said.
“No one is to blame, but we still have so much to learn.”
Earlier on Thursday, Victoria Police Assistant Commissioner Luke Cornelius said Anderson had “murder in his heart” and police were helpless against such deadly intent.
He said Anderson’s behaviour before the attack placed him at the lower end of the police risk assessment scale, but that he was monitored and responded to appropriately.
However, Anderson had an intent to kill which couldn’t be mitigated against, he said.
“No matter how effective our system might be, no matter how accurate we might be, if a man has murder in his heart … we are not going to be able to prevent those deaths,” Mr Cornelius said.
“There remains so many unknown factors on the minds of offenders, or perpetrators, that we won’t be able to account for.”