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They functionally do, at almost all points in time there are enough capsules docked to the station for all astronauts to be able to return to Earth. The starliner capsule is currently able to return if needed, they are having it stay up there a bit longer to check things out to better understand why the one thruster is bad.
Unfortunately, there is also almost certainly a secondary problem in that the parks and rescue services are underfunded to do such overhauls. Granted, some better off ones probably can and will but likely not all.