I realized what is getting to me here. The men present seem to be looking to women for the solution when it is men that are the perpetrators. Any solution proposed is then shot down.
I think the solution is exactly what is happening. If the grapevine suggests there is a problem an independent investigation is carried out the results of which are presented to the individual who is free to deny any accusations.
It seems to be working better than any other approach so I'm good with it.