Are they socially useful? The argument that they are is the same argument that payday loans are socially useful. If people are rational, we should trust that they know what is best for themselves. J.D. Wentworth has testimonials on its website emphasizing how useful it can be to restructure payments. The argument that they are not socially useful is that many people think only short-term and will do things for immediate gratification even though the long-run consequences are disastrous. This position would argue that J.D. Wentworth is preying on those who have self-control problems or are compulsive spenders.
(They have a somewhat different ad that still has the music but a different setting.)