Go ahead, ignore science in favor of your own brand of "logic". I don't think you realize it, but this isn't a perfect world. Even things with 95-99% success still fail occasionally. Just ask any woman who got pregnant despite using contraception. Yes, it happens.That's a bit overwrought. They're not a problem if they never get infected, and even if they do, they're not a problem to anyone who has been vaccinated. They're only potentially a problem to themselves.