Awol, I'm disappointed but not surprised.
"Herd immunity" is a correct answer to the wrong question. I am certain you have seen the "flatten the curve" appeals. Both curves in these appeals have the same fraction of the population catching the virus at some stage, the difference is at what time they catch it. Herd immunity over a long horizon instead of everyone catching it at once has two crucial advantages:
1. It gives the NHS a fighting chance to stay within capacity.
2. We'll have a better understanding of this beast in six days, nevermind six weeks or six months. Flattening the curve gives time for more research into how this disease spreads, which treatments work best and, one day, maybe a vaccine. If I am going to catch it, I want it when I know there's a bed in ICU and doctors have experience on how to deal with this, based on solid international evidence. That will come with time.
Everyone knows the ultimate outcome here is herd immunity. That's not the critique of HMG's response. It's the failure to control the herd immunity that people like Jareth critique.