Well a positive result means you can tell them to isolate, and seek treatment if needed, albeit two days later than ideal.
A negative result isn't much use.
Mostly though I think it is caused by the media needing something readily presentable that they can show to their readers and the readers need to think they're understanding.
And, most welcome by media and certain readers alike, it brings the opportunity to criticise and blame.
Event the BBC has slipped back from it's two weeks of being a proper source of objective and useful information and has returned to its preferred gutter of sensationalist reporting constantly seeking some manufactured controversy to report.
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