I disagree with the bit in bold. I think he felt obliged to refuse as Elijah Muhammad, the NOI's leader, had refused draft to the army previously, and he (Ali) was encouraged to do the same. I doubt it was his idea solely, he was "pushed" into it if you will but I believe he agreed with the principle of the decision. Had he gone he never would have seen any "real" action, he probably would have boxed a few exhibitions for the soldiers. Also, if it was more selfish reasoning as you say, when he was made aware that he'd be stripped of the title, possibly sent to jail and be banned from boxing he'd have folded. Opinion also changed on Ali' and his draft refusal as public opinion on the Vietnam war began to change - more people of both colours that were previously unsympathetic with his stance softened due to a changing perception of the war. So in the long run I don't think it was too harmful a decision, except the obvious damage to his career as it led to such a long lay off.
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