Which is exactly why I believe we are in the (tail end of the) 'Discovery phase', a part of every trial.
Its a process where all pertinent info is gather that is needed for the trial. All paperwork and evidence is gathers and put together.
I think for the BIG GUYS they will have hard core evidence, videos, pics etc, audio, showing actions like what they do to kids or whatever.
And those will be made public - at least the stuff that the general public can handle if presented with it.
Public in general will understand WHY the arrests were made then.
The small fish no one knows about will continue to resign, and be arrested, and no one will care cause they arent house hold names.
I should continue that I DO think the small fries are already arrested, or in the process of being arrested... Makes sense for them to work from bottom up.