I don't condone going after minors, not at all... But that was a secondary development - initially he got busted sending a pic to a college student, definitely not a minor. Also, I do recall reading that the girl's parents said that he hadn't sent her anything really explicit, and the feeling I got from their statements was that they didn't think it was a big deal.
And I know it's not exactly poly per-se, but I think it bears discussion within the context of polyamory - if he hadn't been lying about it, would the reaction have been the same? And in a world where poly was not so unheard-of and un-accepted, wouldn't people have more incentive to be honest about these things? (that being said, if the mods think this fits better in the fireplace, then please move ahead)