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If you look at it simply, asking an addict to return to their "drug" is pretty cruel and unfair. However they had basically run out of options. So I can see where the scoobies were coming from. But I still don't think it's right, because Willow was in a place where she needed support to help her through a problem. Some claustrophobia and pretty intense panicking shouldn't change that.
Yeah it definitely came from a place of desperation, so for that the gang can be forgiven, I think. But, even taking away that somewhat horrible drug metaphor from S6, I do feel for Willow; she'd been struggling for a while by then, to keep on the straight and narrow, and all of a sudden the same people who told her to quit, are telling her to do magic again. Personally, I can see it from both views, so that's a tough question to answer.
They were trapped in a dangerous situation, so I don't think they were wrong to ask, but they had to be prepared to respect whatever answer they got. It was their reaction to Willow saying 'nope' that was the problem
I think they were wrong to ask Willow, especially when they had Tara there who could do the spell which is what Tara did. Having a "just this once" clause won't help Willow beat her addiction otherwise she'd start finding reasons where she had to use magic "just this once".