The OP made this statement:
But it seems like over half of the cases that the ARC is looking at happened within the family of the perpetrator. Certainly, many would contest that they could have done more after the fact to support the victim and ensure that the offender went to jail, but sadly probably very little could have been done to prevent that terrible act.
I disagree with that persons' position/opinion/perspective.
The OP presents that apparent distribution of sexual crimes being within families as an apology or rational for the appearance of this sexual crime within the JW religion.
And yes, it is an apologetic stance. Any sentence that starts with "but" is going to present an apparent reason for an anomaly occurring.
I have been aware that the pattern of sex abuse within the JWs occurs systemically - it happens at all levels, within and outside of that sanctified family circle. The WT has taken, for many decades, the legal position that the family unit is sacred. They have fought many legal battles on that principle and have taken that stand in their battle to have it ethical for parents to refuse life saving medical treatments for their children.
The factors that foster a climate of familial abuse are varied and the WTS is responsible for contributing to the problem. The numbers that we have available that point to this phenomena, that over half of the cases are familial, reveal that the WTS is aware of this too. Of course they are.
And yet what did they do right after the ARC started? They released a video for 'educational' purposes that was shown to parents and children that depicted the abuser as a stranger, a monster. And, the children were instructed to "tell their parents first". Really? The WTS, through the use of this video, reveals that they are reinforcing familial abuse, not preventing it.
The WTS wants to keep the family unit as a closed, sealed unit, where the parents (AKA parents who follow the WTS orders/rules) have full control and power over minor children. It is that ideology and practice that fosters and maintains familial sexual abuse.