The anti-vax stuff really pisses me off, especially when it's spouted by people born before 1960. Polio killed so many children and crippled the ones it didn't. And practically overnight, we developed a miracle cure in the form of the polio vaccine. Completely eradicated in North America when it used to kill thousands each year. There are people alive right now who can remember losing classmates in grade school to polio.

Then you get into stuff like whooping cough. Basically unheard of for fifty years because of vaccines. Now it's come back and people are finding out it's fucking terrifying to die by coughing up your lungs.