trisher
growstuff as I understand it in order for vaccines to work a certain percentage of the population needs to be done. With limited amounts of vaccine I can't see how that can happen. Of course it will protect those who are already exposed to the virus, but those sheltering may be lulled into a false sense of security because they have been vaccinated.
It depends on what you mean by "work".
My understanding is that the Pfizer vaccine stops about 90% of infected people from developing the severe symptoms, which kill people. It has not been established whether it stops anybody catching the virus nor whether infected people are infectious.
It's good news for the most vulnerable because they will hopefully not develop symptoms and fewer will die.
In time, it could mean that everybody gets infected but, if they're vaccinated, they won't develop symptoms. That's a different idea from so-called herd immunity.
If everybody were vaccinated and if immunity lasts for life, we could have a situation where humans live alongside the virus, which can't do much harm.
The catches are that not everybody will be vaccinated and we don't know how long immunity lasts or whether it will mutate. If we ignore all the safety precautions and life goes back to "normal", the virus will still be doing the rounds and some people will still be very vulnerable. It won't be like smallpox and totally eradicated. It will be many months or years before the effects of vaccine on a whole population can be evaluated with any accuracy, especially as the whole world (all 7.8 billion of us) will need to be vaccinated.
So, yes, the vaccine will hopefully "work" by protecting the most vulnerable individuals, but nobody knows whether it will "work" at eradicating (or severely reducing) transmission. I agree with you that some people might be lulled into a false sense of security.