There should not be any ambiguity, since a sentence like this should not exist in isolation and should always appear in some context. This context will make the meaning clear. However, if the sentence is given in isolation, with no other context, there still should not be any problem with ambiguity, because the meaning that would pop into your head first today would be the first one, that he is right to be troubled.
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AnonymousHow can this ambiguity be resolved?Where context doesn't resolve the ambiguity, rephrase.