"They also need to balance risk with what occurs when they shut the economy down."
They should definitely NOT shut the economy down
What they should be doing is taking prompt lower cost - or no cost - measures like some other countries are doing,
to avoid the need for more drastic action later
The UK govt seems to be gambling that there won't be too many cases and that it won't have to do anything to annoy anyone
That's a big gamble
Italy waited too long and now has over ¼ of its population in quarantine,
which probably has shut down a massive chunk of its economy