This seems like an extreme worst-case scenario - if you are a typical criminal why would you escalate from a mugging to attempted murder? Now, there could be a

This seems like an extreme worst-case scenario - if you are a typical criminal why would you escalate from a mugging to attempted murder? Now, there could be a few people whose RFIDs would unlock Really Important Things, but for ordinary folks, I don't think you'd need to invest in a suit of chainmaille (it'd interfere with readers, anyhow).