I said that the poll sentence didn't work for me, not that it was wrong, because from it, and we are dealing without wider context, it doesn't convey obstinate refusal to me. If the example said 'if only', then I would be much happier with it, or if the sentence dealt with someone else orsomething that was harder to control, like drugs or alcohol. I don't think it's a wrong sentence, but I think it is forcing it to extract obstinate refusal from it.
