Some words about corruption in general, without any direct reference to any person so far mentioned in this thread:
When corruption becomes endemic to an organization, it is very difficult to stop. Many persons wind up knowing the "dirt" on other persons. So everyone is compromised. Someone gets caught and liable to face consequences, and he simply says, "Discipline (or charge) me for A, and I'll go public about your problems with B." Everyone's beholden to someone (human) for his existence, or work, or career, or income. Indeed, making use of corrupt persons who would not otherwise be "useable" is a sure way to ensure their loyalty and that they will not refuse to do "dirty work" when called on to do so by those to whom they are beholden.
In such situations, it's common that when a decent person discovers some bad stuff going on, and innocently or conscientiously blows the whistle through proper channels, he himself winds up disciplined or charged.
It becomes quite the many-layered onion. Only God and Time can resolve things.
This armchair philosophy is provided absolutely free of charge.