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Evolution ordinarily shapes viruses to become more transmissible and less virulent. Because the only 'goal' of a virus is to more efficiently replicate its genes, which is at odds with the killing the host. Thus, mutant strains which are less deadly are more effective at transmission and will be preferentially selected via natural selection.
Vaccines are effective because they sterilize the virus, preventing viral replication (each replication introduces the possibility of mutation). The COVID19 vaccine is non-sterilizing. It does not prevent or even provably reduce the replication rate. It does however reduce the severity of disease. At the level of the individual, this is fine; the vaccine works. Let us acknowledge this. At the population level, the effect is catastrophic.
When you have a vaccine that lowers the incidence of death without meaningfully reducing the replication rate, two immediate problems emerge
1) Every viral replication has the possibility of generating a vaccine-resistant mutant, reducing efficacy of the vaccine for high risk patients. A vaccine-resistant mutant would be unlikely to ever arise, much less proliferate in an unvaccinated population.
2) Host selection (death) is mostly eliminated and It becomes possible for strains which are more deadly to become evolutionarily successful. However, these strains will only be more deadly to the unvaccinated. There are millions of people who are medically obstructed from receiving the vaccine.
>tldr
By taking the vax you are making it less effective for the people who need it most, and you are killing those who are unable to take it.
