The vault dwellers make a good addition either as fresh recruits for Survivors, or as foes for someone exploring that cave opening.
The dweller can be distinguished from the Sole Survivors due to their lack of armor.
But that doesn’t mean they aren’t ready for action.
Vault security is also available to put down any insurrection. Though with the careful planning of Vault-Tec, they surely won’t be needed.
Perhaps non-lethal attacks will be enough.