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.
Did you take any notes that could serve as corroboration of your conclusion? "Name / reason" sort of thing? I'm not going to read 20 articles, because I don't really care. I figure some will get out because the gravy train was going to get lean, time for getting out is good, and so on (meaning directly assignable to Trump policies), and expect an uptick of 10-20%, at the most, for that reason. The raw numbers seem to track a 5 or 10 year cycle - high to low number.
I couldn't prove my sense of what's going on, it's mostly based on intuition. But it would take more than a conclusory statement for me to accept that 80% of the names on the list left "for nefarious reasons" even if I give wide latitude on what constitutes nefarious reasons.