The UK (and I'm not saying I agree with this) says that people are going to get covid-19 no matter what we do, so we want to get as many young healthy people to get now as possible. That means they stop being vectors for transmission, and it means we can manage hospital admissions and "cocoon" vulnerable people.
personally, I think this is a risky strategy that's going to cause hundreds of thousands of deaths and totally over-whelm our hospitals who are already struggling under winter pressures.
https://twitter.com/iandonald_psych/status/12385183716516495...
https://thesmallplaces.wordpress.com/2020/03/13/cocoons/