If that's a rule it was made up by people who hadn't considered the edge cases. If you're ending a sentence with a quote, and the appropriate punctuation marks

If that's a rule it was made up by people who hadn't considered the edge cases. If you're ending a sentence with a quote, and the appropriate punctuation marks are different for the quote and the sentence, then you should do whatever makes sense, with question marks trumping fullstops. For instance: 1. Did anyone else think "Battlestar was right"? 2. I thought "Battlestar was right." 3. I thought "Was Battlestar right?" 4. Did anyone else think "Was Battlestar right?" Oh yes, and the relevant "rules" differ between American and British English anyway.