10. to expose deceitful tactics of the cheating spouse which, if unverified, may lead you to make false assumptions and tactical errors (ex.: cheating spouse says they want to go to MC to try to work on reconciling the marriage, but they confide to a BF that they are only doing it to buy time while they squirrel away marital assets to be used on a divorce).
I could easily come up with a DOZEN examples of how I may have erred -- from minor mistakes to what may have been sheer DISASTER -- if I didn't have good intel backing me up.