I get it, but I don't

Mike Garrison resigned as President of West Virginia University.
I understand, but at the same time I don't.
Yes, the faculty, alumni and some very powerful donors - all with axes to grind - gave Garrison no-confidence votes and threatened to withhold donations.
However, nothing concrete - no smoking gun - ever came out directly implicating him in the Heather Bresch degree scandal. Garrison was given - and still has - the support of the WVU Board of Governors. From what I can tell, the guy was honest and upfront about his role in the scandal; i.e. he had a very - VERY - limited role in the matter.
The Pittsburgh paper that launched the investigation never found much of anything to tie Garrison to the chicanery. Yet he's the man out of a job.
How is it that all the people who were actually involved in this matter are: 1) still employed by WVU and 2) still receiving their same salary?
Should Garrison have resigned? Probably. But there is no way he should be the only guy caught up in this. His head should have been the last to roll. Not the first and only.
Yeah, yeah some of Garrison's underlings were demoted (to teaching posts) but they are still on the WVU payroll and they still retain plush, six-figure salaries.
Like I said, I get it, but I don't.