Actually, that is not true. It has to do with the statistics of probability. If I am fully vaccinated, I have maybe a 5 to 10% chance of developing covid and if I do, it likely will be a mild case (statistically speaking). If 100% of the St. Maarten population is vaccinated, based on the above, less of them are likely to develop covid and therefore be able to pass it on to me. It has to do with diminishing probability.