That whole "I was changing the culture but it has been ingrained for decades and I could not turn it on a dime" is horse shit! Anyone who has had sole responsibility for a group, be it 5 or 205 people, know that you can immediately impact the "culture" of the group. You lay down the terms of the group identity and behavior..."cross the line and you are gone...no band membership, no alumni band membership, no symphony band, no pep band. You are Gone, you are persona non grata!"
It is not my place to say that Waters is guilty or innocent of these allegations. But for a person to say I could not affect the behavior of those under my charge is not a very sound defense. In fact the person should be removed for that alone. That is what being in charge means.