If not retribution, it still paints a big target on the kidnappers' heads for being found by the superhero community quickly. The Outsiders waited for John Walsh to go on his show, do a special about the ring, then recieve and act on tips he was sent. Batman would have done all sorts of detective work, Superman would use his super-senses, and Wonder Woman would lasso-of-truth some of the slave ring guys that were already captured for the locations of their bases. They would know where Lian was within an hour of being called and busted the entire ring in another thirty minutes, as opposed to the implied several days it took the Outsiders.
At least, that's how I wish things like that would go. Yeah, it's not a good story if they ("they" being whoever is the star of a book) call in the Big Three/JLA/JSA/GLC/Titans or whomever every time they run into a problem such as that, but... yeah. It should be an option when necessary. Pet peeve I guess.