FBI agents finally arrested Robert Durst last Saturday at a New Orleans hotel for the murder of Susan Berman, which occurred 15 years ago.

Better late than never.

Thanks to the HBO documentary about Durst’s links to three killings, the victims’ families will finally achieve some justice from a system that has utterly failed to do its job.

In 1982, Robert Durst claimed that his wife, Kathleen, had suddenly disappeared from their cottage in South Salem, New York. No one was ever charged and her body has never been found.

In 2000, Susan Berman, Durst’s spokeswoman, was killed at her home near Beverly Hills with a bullet to the back of her head just before New York investigators prepared to question her in the disappearance of Durst’s wife.

After Berman’s death, Durst moved to Texas, where he lived as a mute woman in a boarding house until his arrest in 2001 after dismembered parts of the body of his elderly neighbor, Morris Black, were found floating in Galveston Bay. Durst claimed he shot Black in self-defense. Despite admitting that he dismembered Black’s body before dumping the remains, Durst was, unbelievably, acquitted of murder.

But the injustice that allowed a sociopath like Robert Durst to remain free for all these years while he continued to murder is not solely the fault of the justice system.

Durst is the oldest son of the late real estate mogul Seymour Durst whose Durst Corporation manages the World Trade Center and is reportedly worth $4 billion. Robert became estranged from his family when his brother Douglas was chosen instead of him to run the family business.

Despite Douglas’ fears that Robert would kill him, and the restraining orders family members took out against Robert, the Durst family spent thousands on high-priced lawyers that allowed Robert to beat the murder charge against him and to remain free.

People can argue all they want about the right to an adequate defense, but while the family’s money and power protected them, their defense of this sociopath ultimately led to the unnecessary deaths of others. For that they should be ashamed.