The topic is complicated because it encompasses macro issues. Many diseases not only have treatments but have been eradicated, like smallpox. The technology that exists now has prevented people from dying earlier because, without tests to detect tumors or harmful agents, people were dying. It's known that medicine is a business; it's more profitable to have sick people buying medicine every year than to cure a disease. Diseases aren't addressed in terms of eradication because they don't affect everyone; they aren't contagious or are extremely difficult to transmit. Since they don't affect everyone, I think they aren't a lethal danger...
Do people harm themselves because they seek it out? Or because the world gives them the tools to do so? A person isn't born obese, but there are hundreds of stores outside selling sweets, candies, and millions of other sugary products. These things don't directly harm you, but if a person consumes them without limit, they will have health problems and will need medical treatment they didn't previously require. Although it sounds bad, there's another side to it: all these companies provide jobs for thousands of people, creating direct and indirect employment opportunities. When someone gets sick, a nurse, a doctor, or a clinic is ready to receive them, and their families will have food to feed, thus continuing the cycle.