> If I am vaccinated for chicken pox why do I have to worry if my friend is not vaccinated for it and gets it ?
Vaccines don't work like that. They give you a better chance of not getting something (chicken pox vaccine is 90% effective), and the rest of the vaccine's effectiveness is made up in scale (if everyone has 90% resistance, the virus has nowhere to "catch hold" and just disappears). Many people don't get that, and think vaccines should either be 100% effective or they shouldn't be used at all, or they don't understand that they only work well when they are applied at scale (which is why schools mandate many vaccines with few exceptions).
> his is the kind of stuff that happens in a communist country like North Korea
Or America in the 1950s and 1960s when they wanted to get rid of polio, chicken pox, measles, hepatitis, etc... It is crazy: America back then didn't care about these nut case concerns, they were just focused on getting the job done. What happened to this country?