If someone told you to violate a rule that you knew was wrong, would you?
If you witnessed someone lying or violating a rule, and did nothing about it, that is complicity or being an accomplice.
Character often determines the answer to those two questions. In athletics, golfers are often good examples of good character when they call penalties on themselves. Playing partners call penalties on others to protect the entire field. They would rather not win if they have to lie or cheat.
That is what happened in the meeting described in the book that you are referencing. White lies, black lies, gray lies, they are all lies, regardless of how you shade them, and they perpetuate.
Galloway was certainly part of the problem, but no one man should be able to bring down an entire program, as well as, be the procuring cause of all of the alleged violations or infractions.
This episode was like an "athletics watergate."