The point is, there's no reason why any other victims' families would have reason to hunt down Oliver and seek vengeance. He already told them everything he knows. The only reason Hackett came after him is because he got hold of the unredacted transcript where Oliver confessed what happened on the life raft. That's new information and thus is prompted Hackett's actions. Oliver has no more new information about the Gambit to reveal to anyone, so there's no story to be told about any of the other survivors' families. If Sara's return from the dead got them wondering if anyone else might have survived, that would be something that happened 5-6 years ago, and if they haven't found anything out since then, they've probably resigned themselves to their losses once more.