This is enforceable in remote island countries, but in ie Europe its not. You can't 100% lock the borders, there would be shortages of basically everything, from food to materials used in all industries. Europe is not so unified as US for example, there is a lot of independence, for better or worse. Food is transported on trucks, till it reaches from Spain say Poland it crosses minimum of 4-5 countries, each with their own covid situation, laws, rules, bans etc.
If we knew back a year ago how bad things would get and are still getting, I believe such a lockdown for say a month could pass, otherwise not and there isn't a central authority that could enforce it. And saying it was to be expected doesn't make much sense, spread of predicted outcomes was basically between yet another flu to another spanish flu.
If we knew back a year ago how bad things would get and are still getting, I believe such a lockdown for say a month could pass, otherwise not and there isn't a central authority that could enforce it. And saying it was to be expected doesn't make much sense, spread of predicted outcomes was basically between yet another flu to another spanish flu.