There are two approaches to Covid-19 epidemics. In the south Korean and Chinese method the disease is cleared from the country and then the borders are policed aggressively and in the Western Method the entire population is exposed in waves until herd immunity stops further epidemics. These are the Nationalist and Internationalist solutions.It may need between 10,000 and 100,000 deaths in the UK to achieve herd immunity. In this process a lot of younger adults may die.Worldometer.com The Internationalists will tell you not to worry, only 2,000 to 20,000 of the deaths will be younger adults (they have a lower risk of death but 80% of UK population is under 65) and the 8000-80,000 old people who may die don't matter, they are going to die anyway. Compare this with less than 4000
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It may need between 10,000 and 100,000 deaths in the UK to achieve herd immunity. In this process a lot of younger adults may die.
The Western governing classes are still largely Internationalist Extremists and cannot countenance the idea of strong border controls. These are the same people as those who supported Remain in the EU Referendum. You can test this by asking any friend who was a Remainer whether it is better to keep very strict border controls* for years or to develop herd immunity in the UK. Just to tease the Internationalists you could then ask them whether quarantine would have been a good idea for AIDS (See AIDS: The Great Holocaust - over half of the over 30m people who have died of AIDs were women and children).
The Great Economic Recession of 2020 is actually the result of having wide open borders. Without our unnecessarily high intensity of International Trade and open borders the economic effects of Covid-19 would be far more containable. (See Coronavirus and International Trade).
* enforcing tests on all people visiting the UK from overseas and quarantining all those arriving from infected countries for 14 days - there will probably be infected countries for years to come.