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All of the rules are about managing probabilities at a population scale.
Allowing small, specific groups to be exempt is absolutely consistent with the science, because even the worst case scenario doesn't significantly increase spread at a population level.
Whereas every grumpy git in the land deciding not to follow the rules does significantly increase spread.
Although if allowing the former results in lots of the latter, which we know it does, well...
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There are a few other exemptions eg Pro Sportspeople.
We have a potential shoot coming to ours and they outlined the covid prep the crew goes through including all being privately tested weekly and temperature checked onto the site everyday. So even though no quarantine they will be being more heavily screened than Joe Bloggs on the way to work.
How incredible that actors, directors and DOPs all have 100% guaranteed immunity and can avoid quarantining?
Fully appreciate that allowing people to earn money again is important, but this does seem like a very un-scientific and unfair rule.