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> And I tried to look at that from the point of view of a normal non-tech person who doesn't know about view source or curl

Safari read aloud would have blurted out the SSNs in this case. So even for a layman, the lock analogy falls short.

> Like what if I sent out a paper newsletter to all my neighbors but printed it on recycled paper that happen to have SSN info on the other side

Court would place responsability on the person who failed to inspect the paper used. There's a reason medical offices all have shredders; you can't reuse paper with patient's personal information on it.