“It’s not so much that I need a reason not to have my privacy invaded, it’s that somebody else should have a reason to do it. That’s kind of the point. That’s surely what it means for something to be “none of your business”. And yet, to refuse the search is to immediately mark oneself out as suspicious, as concealing something that is in fact somebody else’s business, because of the security-logic presumption that everyone is guilty until proven innocent.”