Re: It's a political decision, not tech/safety
They do have the Canada arm to move an immobile capsule. But the key word being immobile, not tumbling or drifting. As a worst case, they can probably survive long enough to climb to a hatch in their pressurized flight suits, assuming the capsule is moving/tumbling slow enough for them to aim and push off and grab hold of the station. Of course, all that would probably be moot if the thing really screwed up and collided with the station. That capsule inspires such happy thoughts!