I feel I must disagree with the OP to a certain extent.
1. We were dealing with an unknown disease.
2. I believe that the NHS would not have been able to cope with a mass pandemic at the time - they were wrong-footed with insufficient ventilators and PPE, so the only way to cope was to lockdown to slow down the spread of the disease until such time as the NHS could get back on its right feet.
3. The disease does affect different people in different ways - the elderly, BME population, and those with underlying health conditions seem to be worst affected.
For these reasons, the lockdown was appropriate. It is selfish to allow the 'less at risk' groups carte blanche and risk exposing the 'at risk' group to the disease. For a graphic description of how one person fared with Covid-19, he/she had to have a double lung transplant since their lungs were sticking to other parts of their body and their lungs were full of holes. It is not fair to expose the 'at risk' population to this sort of outcome.
For many, simple steps can be taken - it is all about washing your hands, don't touch your face (transmitting germs via mouth, nose or eyes), keeping your distance and being vigillant. We do need to get back to a state of normality for our mental and physical state, as well as the economy; however, the new 'normal' will be different from the old normal. There will still be queueing at shops and supermarkets, High Streets will suffer with only 'personal services' being offered, i.e. restaurants, hairdressers, banks, etc.
The extreme measures described in previous posts (GP surgeries closed, school walls bare, the station toilets taken out of use) are over the top. However, we need to trust that everyone takes the simple steps stated above to stop this disease taking a hold again.