Agree to disagree, as we would have to quantify the wrong here and compare, which I don't think is possible. I definitely see your point though, and would be inclined to agree, I just haven't thought that aspect out.
---------
Something to consider, and this is just nerd shyt, you could expand the idea of posting the video online as a disapproval of cheating that could branch to other families, thus disincentivizing cheating due to public embarrassment, thus reducing the % chance of cheating occuring, thus the good outweighs the embarrassment of the mother. Also the embarrassment could be temporary, and could possibly lead to the mother living a better life separated from the cheating husband, thus an overall net positive. Moral luck, obviously, but net positive result.
---------
I'm just throwing that argument out there, I don't like to get super technical because most honestly don't think like that, so the assumption is that I'm crazy or not to be taken seriously when they read it, it's better if I'm taken somewhat seriously at the minimum. lol