Earlier quoted context omitted.
Holmes figured out a pathway to violate the trust of old man wisdom. Sounds like she just fished the right old men. One of those that that’s incredibly mature in one aspect of life and threw all her effort in that direction naively ignoring the rest of of what “trust” actually facilitates. Poo poo for the men who were fished... don’t s*!t where you eat.
What on earth does that even mean in this context? "Don’t shit where you eat" is a warning against office romances. This is plain old fraud AFAIK.
It's a warning against poisoning an environment on which you depend that has been applied to lots more than office romances, though that may be the most common use in some social circles today.