I don't think that's the case at all. I think if Juliet had given up on trying to get Sun to stay, people would have bashed her for that too, saying that she's bad at her job. She was desperate to get Sun to stay, and I doubt there was another way to make her stay. If she had told Jin the situation, he probably wouldn't have believed her either and said 'I'll do whatever Sun wants to', either that or he wouldn't have understood and Sun wouldn't have translated for him. It was a on-the-spot, last ditch attempt to get her to stay, and obviously it worked. I wouldn't put a villianous status on her because, at the end of the day, whether it was to make herself feel better about her job or not, she most probably saved Sun and the baby's lives.
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