Excellent points.
The Boris Johnson way is fucking stupid.
If you deliberately allow the healthcare system to be overwhelmed, a lot of young and fit people with treatable injuries or infections may end up either dying or get their health comprised due to delayed care. Then you imagine it's only the OLD folks we are sacrificing? You might be leaving the young with a lot of unnecessary health problems down the road or even unnecessary deaths.
What about the doctors and nurses? YOu gonna work them likes horses until they drop dead one by one? No one will sign up for medical profession in your country again. How are you going to rebuild the country?
Flatten the curve and don't panic and stay the course. this is not rocket science.