Yes 60% will have to get it but the 1% death rate will happen to the vulnerable so let’s let 60% of the healthy people get it
No - if you let 60% of the (apparently) healthy people get it, a percentage of those (healthy, younger) people will die. A higher percentage of them will need oxygen and hospital treatment and some will need intensive care - which they will be unlikely to get because we don't have enough beds, staff or equipment even for all the younger people who will have more severe illness.
It might be a lower percentage of the population that gets severely ill or dies, than if all the people with known vulnerabilities are still out and about catching it, but it's still a lot of people.
We could reduce the number of younger, healthier people who will get severely ill if we try really hard to slow down transmission. Even without locking the whole country down we could all be doing more - but the message from the government is carry on as you are in terms of everyday behaviour apart from handwashing, and they've increased the chance of people getting it from contacts of infected people - instead of being told to stay at home for 14 days, those contacts now don't have to stay home at all. They haven't even asked people to try to do that if they can.
It's not all about a full lockdown vs. the government's plan - there are lots of things they could be doing in between but aren't. Why not? It seems really baffling. Why is it they apparently don't want as many of us who can, to circulate less and distance ourselves to reduce transmission, as fast as possible? They could get us all doing more, without going all the way to shutting schools completely and having a lockdown. It seems as if they want the virus to go very fast through the non-isolated people, but those non-isolated people aren't all going to survive either.
There are always competing schools of thought in science and there are always scientists who disagree with each other. I wish I had the confidence some people have that the view that happens to be dominant in advising the government is definitely the best one, and that its combination with political philosophies isn't pushing things too far in a 'let it burn' direction. I would have a lot more confidence if other countries seemed to agree.