Do they also have the “moral obligation” to see to it that the police investigate these alleged crimes?
Finally a remark that makes some sense. Of course it would be strange if RV would demand JW to report abuse, and not do it themselves.
Now it should be remarked first that RV doesn't simply say that JW elders should report all abuse cases to the police. Instead, RV wants JW elders to encourage victims to go to the police, and actively support them when they report to the police. RV does exactly that themselves: encourage victims to go to the police, and actively support them when they do.
RV also wants JW to actively encourage victims to seek professional help to cope with their trauma. RV does exactly that themselves: encourage victims to seek professional help, and refer them to a suitable organization or professional.
RV also wants JW to drop the 2 witness rule when deciding what actions they'll take to support a victim. And of course RV doesn't require a victim to come up with a second witness before they offer support.
RV wants that JW become more open and transparent wrt abuse. They also want JW to acknowledge and empower abuse victims instead of ignoring them and silencing them. RV does exactly that: speak openly over abuse within the JW community, acknowledge he victims and give them a voice.
So while your remark would have some merit if RV only demanded JW report all abuses cases to the police, it should be clear that RV tries to do exactly that what they want the JW to do as well.