the family was not out $5.9 billion. Their suffering I think is dubious.
In a sense the family might well be out that amount or more. The future income which could have been generated must be taken into account.
Family members suffering is also quite possible and very real. They have lost a beloved member of their family. Perhaps he was the father of children and they may now be left somewhat adrift as they navigate through life without this man. No actual monetary amount can be attached to that; however, it's good to have something there for them. In this situation it is also a reminder to the police departments to get their act together.
(if this is about the 2014 murder by cop (and EMS) of Eric Garner, may Pantaleo be the one who is stripped of his worldly possessions...apart from what is necessary for his basic survival and that of his family)
Additionally, if this is related to Eric Garner, recompense is also a reminder of how family can be harmed. His daughter died towards the end of 2017, quite possibly as an indirect resulting effect of the brutality of her father's murder. She was one of those who suffered and there was not anything dubious about it.