Jeremy Kyle and Jerry Springer's shows have had vulnerable subjects. When asked by Jeremy Paxman whether or not it was stupid, Jerry quite openly said it was because it makes good TV. It is the public humiliation in front of millions that is wrong.
For reality ellimination shows such as The Apprentice, Big Brother, and the like, again public humiliation but not through personal disputes. Only those who want their 15 minutes fame, but with little ambition through which to achieve it.