Herd Immunity - COVID19

Those referring to herd immunity without any other mitigation other than self isolation after an individual could have been carrying and spreading the virus for 14 days should not be in office.
The key factor is to slow the spread as much as possible for the following reasons:-
1 To slow the impact on society and increase preparation
2 Reduce the impact on the health service by controlling and reducing numbers infected at one time
3 Reduce the number of deaths of the vulnerable both young and old
4 Increase the time we have to develop a vaccine and save as many people as possible
Many countries are taking more steps than Britain for logical reasons. Are we really just going to leave the status of Britain to survival of the fitness and natural selection?