To be honest, I don't think group immunization is a reliable thing. On the one hand, the virus will mutate, and on the other hand, there are too many uncertain factors in group immunity. Under such circumstances, although group immunization may be realized in theory, it is not the best epidemic prevention method in real life.

1. Viruses can mutate

To a certain extent, group immunity can't stop mutating viruses, so in this respect, group immunity is not reliable. This is because although human beings are immune to the virus, with the variation of the virus, human beings may not necessarily produce new immunity to deal with the mutated virus. In other words, if the speed of human immunity can't keep up with the speed of virus mutation, it is almost impossible to achieve group immunity. I believe most people know that Covid-19 will mutate. After all, since the outbreak, people have found several mutated viruses, such as Delta strain and Omicron strain. Therefore, group immunity is not a good choice when the virus is still mutating.

Second, there are too many uncertain factors in group immunization

Theoretically, group immunization is indeed possible, but due to the influence of various uncertain factors, the effect of group immunization is likely to be greatly reduced or even counterproductive, so from this point of view, group immunization is not reliable. We should know that the influence of uncertain factors on group immunity is very great, and any adverse influence on group immunity may lead to the failure of group immunity, for example, human beings cannot produce enough immunity to fight the virus, or the sequelae after being infected with the virus are too large. Therefore, it can be said that under the influence of uncertain factors, group immunity is not a good means to fight the epidemic.

To sum up, because viruses mutate and there are too many uncertainties in group immunity, it seems to me that group immunity is not reliable.