Exactly, obviously preventing further infection and spread of the virus which would also give us more chances for mutations is important but it's equally important to realize that even though there may be breakthrough cases it appears that 99% or so of all people in the hospital now with covid-19 are unvaccinated. I'm fully vaccinated and I feel fine but for all I know I could be covid19 positive right now. However if I suffer no ill effects and my immune system can battle it off largely due to my vaccination then that is a good outcome.It's important to understand that as a larger and larger proportion of the population is vaccinated, a larger percentage of total cases will come from breakthrough cases. This does not mean that the vaccine is not preventing cases or lessening the effects. The vast majority of deaths and severe cases are from the unvaccinated population.