Do We Really Need Science to Tell Us This?

Some 'scientists' have expressed doubts about the UK's proposed 'simplistic' traffic-light system for foreign travel (https://www.theguardian.com/world/2021/apr/04/uk-covid-traffic-light-travel-plan-too-simplistic-say-scientists). The postulated system would classify foreign destinations, on the basis of their rates of Covid-19 infections, presence of worrying viral variants et cetera, placing them into green, amber and red categories. People returning from a green location, could travel with no restrictions. An amber location, would require travellers to self-isolate at home (this is often unchecked). Returnees from red locations, would be required, by law, to spend 10 days (at their own expense), in a designated quarantine hotel at an airport. This would apply, at present, to business and educational travel, as foreign holidays are still currently forbidden. There is a danger that the scheme could later be used for foreign holidays. I appreciate the 'experts' commenting but it really doesn't take a rocket scientist to see that the scheme has no chance of keeping problematic viral variants out of the UK. Currently, the 40% of unvaccinated British nationals, would have an at least at moderate risk of picking up a Covid-19 infection on their travels. There is a good chance of them bringing it back home. The scheme is said to include a possibility of countries being reclassified (e.g. green to amber), on the basis of new information. Reclassification would, however, always be done in retrospect (i.e. when it is too late to make a difference). Whilst at their foreign destinations, British travellers are likely to meet with people from a number of countries. These travellers will also have extended encounters with mixes of nationalities at air and ferry ports, as well as on the transport itself. Classifying travellers, only on the basis of the location they travelled from, doesn't assess the risk at all. The only system, that might keep out most variants, is one that classifies all foreign locations, at the moment, as being red. This is likely to be strongly resisted by government, airlines and airports.