In my line of work I see plenty of people who exhibit the symptoms of Stockholm syndrome (varying from children to adults).
http://counsellingresource.com/lib/therapy/self-help/stockholm/
I do tend to think that those who bond with their abusers are in a way developing a ego defence system. Where there is no escape, subconsciously the person protects the ego under-threat and the develops a protective bond.
This is particularly evident when trying to report child sexual abuse or domestic violence or rape; the victim does not wish to supply evidence not because they fear the abuser but because they do not wish the abuser to be convicted. This sometimes makes the role of reporting abuse (child or domestic) and getting a conviction very difficult.
To offer perspective:
Having said this; a majority of cases (something like 92%) do not go to the courts as the victim is treated like a villain by our legal systems. Of the remaining 8% that go to the courts only about 10% result in a conviction (usually because of a guilty plea).
Why do people develop Stockholm Syndrome (it does not need to be hostage situations)?
If you, yourself are in an abusive relationship, then please seek professional support.