Why should we have that discussion? If my spouse was cheating, I'd want to have that discussion in private, without gawkers, and without social pressure from the uninvolved.
I would still contend that you do get to have the discussions surrounding all of this in private, if you choose, or in public amidst people who are going through the same thing that you are through discussions like these, the legal system, etc.
What about the scores of people to whom cheating is a dealbreaker, who now have the means of divorcing their cheating spouses? What is the net outcome of the situation?
Personally? Easy choice, I'd pick not knowing. Others might pick differently.
How so, when all your neighbors and family members can know?
What about the scores of people who have a blue car?