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But, poor Luke was probably so desperate to get off Tatooine, that he probably would follow any nut that gave him an opportunity.
I don't think Luke was all that keen on going with Obi-Wan at first. But after he noticed that the Imperials totally destroyed his farm and killed Owen and Beru, I think he pretty much changed his mind... after all, what's the point of staying there? All his foster family were dead and the farm was in complete ruin!