I'm new to the Fallout series and just began watching the TV show.
My question is simple: Why did the raiders leave Vault 33? One can argue that they want the vault's overseer, but why not leave someone in charge? It seems that the raiders were in very bad shape, having been (surviving) from outside. At Vault 33, they have access to a relative amount of shelter, food, and water. Why give the vault back?