The lockdown was because the NHS was overwhelmed and could not cope after years of politicians and top management (Moneymen or MBA not doctors) running it down. Risk assessments for crisis were ignored for all frontline areas, stocks run down to 'save money'.
As for us deciding at an individual level about the risk are prepared to take - that would be fine if you lived in a bubble, on an isolated island. We live in communities build with high levels of interaction, so any virus that can be breathed in or passed hand to hand will be a risk for others, then still others need to risk themselves, and their families, to treat too many of the original risk takers.
With a disease that doesn't just kill too many, but leaves even larger numbers of people with long term health issues.
Meanwhile you could have got help - I was one of the thousands of people who offered to switch to one-one or small group teaching for parents. Most of us were ignored. Yet I am well-qualified to do this. For years since retiring I did reading support for year 3 and 4. I can also teach creative writing, this would have been my new post in spring but it was cancelled, maths and basic science (my A level were maths and statistics,England and Biology. My physics and chemistry isn't so good but I have degrees in biology, psychology and applied statistics.
I also used to run a playgroup when my children were at school, now I help with a youth study class.
I have a current DBS certificate. I use skype, zoom (yes,with security), microsoft teams, google classroom.