If you saw any of your current coworkers do cocaine, would you go straight to the cops and what would you tell them? What do you think they would actually end up doing about it?
I think the cops would not have enough evidence to actually do anything about it besides he said/she said, and you would totally alienate yourself among your coworkers essentially screwing over your career.
My point is that it is not nearly as black and white as you make it out to be and it is usually better to be safe (don't do anything) than sorry (speak out and ruin your career/friends/network over it).
It seems a lot more constructive than complaining about it anonymously in the news over a year later. I mean, a bad culture persists because people allow it to, so I don't understand why they waited to fight it, given their claims.