" What a strange thing to ask! Why would anyone care at all about people seeing such a trivial thing? I suppose "I wouldn't care because I would have left it open" means "I wouldn't care because it would only be open if I'd deliberately left it open".
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hannahlalalaI don't understand why the respondent would use "would have + pp" here
Question: How would you feel if you found yourself didn't zip up your school bag and many people saw it?
Answer: My school bag is like one you