With respect (again) J, you're completely wrong here and making some assumptions.
People with allergies CAN be vaccinated as there will be a number of options, and even those that DO react will be treated swiftly. Source, my sons best friend who has a lethal nut allergy and will be getting the vaccination as soon as possible with the proper monitoring.
Furthermore, the point of the vaccine isn't just to stop people getting the virus, it's also to stop the virus mutating as fast as it would otherwise, and to encourage global herd immunity, effectively stopping the spread dead.
Furthermore (2) - The first round of vaccinations can help boost the immune response to a point that your body knows how to react to any altered strains in the future, creating a far smaller global health issue than we currently experience. Source, a friend of mine in the USA who is a clinical research biologist (with a speciality in RNA vaccines, mostly for cancer research) who I have been talking to about this since day one.
You can't just look at this as a black and white issue where a vaccine has to be 100% effective AND everybody has to have it or 'what's the point'.