Out of my own experience, and given the worst cases scenarios you hear from it's difficult not to fear for your loved ones (and I mean you literally feel it in your loins) especially when YOUR decision can have even the slightest chance of ruining their lives. -- Edit: Please don't get me wrong, I have kids, and their vaccines are up to date (like mine). A chat with an hospital pediatrist can help, for me it's when he clearly explained that without vaccines a kid can be gone within 2 hours. And virtually it's as narrow minded as refusing to take antibiotics.