I call them exactly what they are, and that's NOT "victims."They weren't victims, they were predators, perps who picked the wrong target.
OK, well I feel potentially sorry for the families of whatever you want to call them.
If it will make you feel better, call the family members of the dead perps, the victims of the dead perps, because that's what they are.
A victim is "a person who suffers from a destructive or injurious action or agency". I did not intend any additional meaning that you may be reading into it.
I agree that the family members were victims of the dead would be robbers, but I'm not sure why you think that calling them that would make me feel better.