There’s an interesting social phenomenon that when we are in a similar situation with a lot of people, in your case roughly 3000, that we all expect someone else to do or say something. Often no one speaks up because if it was wrong, someone would have said something by now, right?
Part of the problem is recognizing that we are all responsible for speaking up in similar situations, and that to do nothing is passively accepting that we are ok with the situation. I also doubt that you are the only person feeling shame for not doing or saying anything that day.
Thanks for sharing and if we can all start taking just a little responsibility, slowly we can help promote change for the better!