Good point. If the Romulan REFUSES to accept the donor blood, then what's the issue? People refuse treatment all the time.
Well, Bochra didn't want Geordi's help either and spent most of his time pointing his disrupter at him. Turned out all right for him in the end when he and Goerdi ended up working together. I guess the real lesson here is that perspectives change once you get to know the other side a bit. Geordi and Bochra had that priviledge, Worf and the other Romulan did not. The refusal was just one meeting between the two, and Worf decided to just let that be the deciding factor. Picard should have been begging both of them.