If the use of analogy is "fancy", then we've reached a new nadir. Reasoned human debate may no longer be possible. Shall we just throw faeces at one another?

I will spell it out. A thing can be effective without being 100% effective. No-one ever said that vaccines were 100% protective against infection. But they are, as the data indicate perfectly clearly, extremely protective against infection, particularly symptomatic infection. If you have been vaccinated, you are less likely to catch Covid. If you have been vaccinated and do catch Covid, then you are less likely to cough it out over someone else. Vaccination reduces the spread. This is not complicated.

Global herd immunity is unlikely. Effective herd immunity within a population may be achievable, if everyone is vaccinated (or has caught the virus). People who have not had the virus, who refuse the vaccine when offered, are actively working against achieving herd immunity.