People believe that we can prevent and pacify terrorism because it comes from a belief system that we disagree with. Diabetes is just caused by the instinct of eating.

Also people don't really "see" diabetes, news don't show picture of sick livers, people don't understand the science of it. Terrorism is easier to represent compared to diabetes.

Also people believe that we can stop being a terrorist. But we can't decide what happens in our liver.

Another big difference is that you can fight terrorism with the military, but not diabetes. So it's less entertaining and less "concerning".