All of them for nefarious reasons or purposes? Every name on the list?
I haven't studied the individual resignations, so don't have a basis for an independent opinion on that point.
The article I linked points out that resignations for nefarious reasons are not uncommon, and a certain number of those occur every year. I likewise (not having reviewed the facts around each individual resignation) have no basis to form an independent opinion of that assertion.
This is why the list is posted as a reference. The news links in the rightmost column provide context. My sampling seems to confirm that the nature of the resignations was in a backdrop of scandal, hence the inference that these resignations are not normal course of the mill.