You can mitigate the risk of dying in a traffic accident unilaterally in ways you can't with a virus, and C19 is probably already killing more people than car accidents by a significant margin.
Sure you don't wear seatbelts and install airbags to mitigate the risk of COVID-19, but the point is that you can take measures to reduce the risk of contracting the virus to a socially acceptable level and not have to destroy people's livelihoods. We have after all not waited for the perfectly safe car before allowing millions of cars on the road. The lockdown in its current form seems more like waiting for the perfectly safe car.