Quarantine has been used since before Biblical times to contour infectious diseases and in each instance it was done to prevent the uninfected community being infected by arrivals from infected areas. Should we have had quarantine a few months ago? Yes absolutely and unreservedly.
Should quarantine be introduced today for inbound passengers coming from a relatively disease free area? NO way, it's too late!!!
Other countries have selective quarantine measures and appreciate the dangers of passengers coming from infected areas.
Not too hard to work out, certainly with the grasp of politicians, but then that's debatable. !!