Man sentenced for keeping daughter as sexual prisoner

It was just a few weeks back that there was a big scandal over a man in Austria keeping his daughter in an underground cellar for 18 long years and fathering 7 children with her (while his wife lived in the same home upstairs). Now, it turns out that this happened in other places as well, and is a matter of grave concern. The bigger problem is that these cases show a failure of societal checks and balances due to this happening for a number of years, and yet nobody noticing and caring. In Argentina, a man has been sentenced to 16 years in prison for doing the same:

BUENOS AIRES: A 73-year-old Argentine man who fathered two children with a young daughter he kept as his sexual prisoner will serve 16 years in prison himself.
Prosecuting Attorney Sergio Antin said the case of Eleuterio Soria had similarities to that of Josef Fritzl, the Austrian man arrested last month for locking his daughter in a basement for 24 years.
Soria's trial revealed that he began abusing his daughter in 1992, when she was 12 years old. The following year she became pregnant by her father, prompting her mother to leave their home in La Matanza, a working-class Buenos Aires district. The family's five other siblings eventually left as well. The daughter, whose name was not released, had a second child by her father in 1997. Unlike Fritzl, Soria used psychological domination rather than physical restraints to keep her in the house. She did flee on various occasions, but would return home after he threatened their two children - often at gunpoint.

The incidents of incest, and such repression and perversion of one's own children are abhorrent, one wonders as to what is going on in the mind of the perpetrators.