The article notes:
In 11 stings, the show has exposed more than 250 potential predators, many of whom have been convicted.
In this latest round, the one that ended up with a guy dead, none of the men was prosecuted.
Note the language, the show exposed more than 250 potential predators. Many men were exposed as potential predators without ever being prosecuted or given an opportunity to refute the charge. NBC proceeds immediately from arrest to prosecution to punishment, all in one step.