I think it will be impossible to know what exactly happened at the club, who knew and what they did. The club let down the young people in it's care by the sound of things and now they need to found out was it deliberate cover up, was it willfull blindness, was it sheer incompetance? Whichever of these it was the people responsible need to be found and nothing like this can be allowed to happen at the club again, one hopes it is already as safe as can be but you can never be sure.