The High Court of New Zealand heard the case MHS v. PIW this past August regarding the grave risk of psychological harm stemming from a child with autism's return from New Zealand to Australia under the Hague Abduction Convention.
The mother posited two arguments in trying to stop the child's return after she wrongfully removed him, but here we focus only on the argument that the return would have exposed the child to grave psychological harm.
To show a grave risk of psychological harm, the mother provided evidence in a police protection order documenting the father's "drunken verbal abuse, and yelling and screaming in front of [the child]." The father had also "grabbed [the mother] by the throat, pushing her back as [the child] was screaming." He had also "[o]n occasions  demanded money in an intimidating way[,] and  he had failed to arrive an occasions when he had been due to take care of [the child]." Sounds risky to me.
In addition to this evidence, the judge also noted that the child was terrified each time he left his mother to visit his father.
The father's counsel noted the child welfare services in Australia that could protect the lad. The child's counsel acknowledged risks, but "there was no evidence that violence had been directed at [the child] himself." I would have argued that any violence in front of the child is directed towards the child.
Weighing this evidence, the court put more focus on the Australian legal system's ability to deal with such risks rather than the actual gravity of the risks the child faced. The judge was "not satisfied that any of the issues that [the mother] raised could not be accommodated by appropriate orders able to be made by the Court in Australia designed to ensure that [the father's] contact with [the child] did not result in the repetition of inappropriate conduct."
As we see again, getting the grave risk exception is an amazingly difficult feat. Now, this mother must move to Australia for a time and rely on child protective services in Oz, should any further abuse occur.