Sort:  

Polio. Measles. Mumps. Whooping cough. Smallpox.

Some of these things can't just be treated and cured, or have lasting scarring on the body.

What is bad about any of those? I think we can forget about smallpox, as it is literally eradicated thanks to vaccines and treatments. But if we just look at the others... what's bad about getting them and treating them? Is the medical profession incapable of dealing with them? Is there something bad about getting or treating a disease?