Talk about missing the point entirely.
I can safely have the injections (i.e. they won't harm me) there is however no evidence that my immune system will react to the vaccine. There is evidence that in the general population it is highly effective.
I had absolutely no side effects from either jab, and am currently paying for a split IgG and IgM antibody count, because if I haven't responded the vaccine, then I probably need to isolate from my wife and kids *again* - and that sucks more than you can possibly imagine.
The overall rate of infection in the country (or more specifically in the region we live) is massively important.
If I lived in an area without any buses the chance of me being hit by a bus would be low, if I lived on a street where every bus in town came though, and the drivers were always drunk and reckless, then my chances of being hit by a bus would be higher.
Which place would you go out for a walk?
"The unvaccinated half are being protected by beibg under 40, a Protection they always had, which is why they are being done last"
Yeah - they tended not to get seriously ill and therefore be a major danger to the NHS, but they are just as (if not more) likely to spread the virus than older members of our population.