> As other commenters have noted, this case study further supports the widespread observations that COVID-19 vaccines reduce the chance of severe (symptomatic) illness but do not necessarily prevent infection and transmission.

Your argument that the vaccine stops only symptoms and not the infection is false.

If that was true, we would not see countries that practically eradicated the virus instantly after vaccination (like Israel). The virus would still be spreading and infecting people, and those unvaccinated would still be getting seriously ill.

> That being said, IMO there seems to be a growing public opinion that unvaccinated individuals are to blame for the increasing dominance of variants of concern (delta, gamma, etc).

The vaccines have proved to be effective preventing infection from the original strains.

If people have vaccinated then, it is likely we would have been done with the virus.

Now, there were not enough vaccine doses to vaccinate everybody in the world in time, so a strain developing in a poor country could still reach western world. So it may not have been possible to prevent delta completely.