That totally depends on circumstance. For example, an acute fever is part of the body’s healing process when we are infected, and treating the fever does nothing for the infection, which is why many doctors now recommend letting a fever run its course, unless the fever itself is doing damage. But your point is well-taken: the reason many of the childhood diseases need to be vaccinated against is that they are capable of doing long-term damage, quite apart from the immediate symptoms. Rheumatic fever caused heart damage in many children, measles can cause cognitive impairment, blindness, etc., even if you treat the immediate symptoms.
In other cases, however, the symptoms are the disease. For example, the best treatment for cholera was discovered to be simply assisting the patient through the symptoms, because the biggest problem was dehydration from the diarrhea. Get patients through that, and they’re fine.
The disease of which diabetes, Alzheimer’s disease, obesity, cardiovascular disease, hypertension, and fatty liver are all symptoms already has a name, btw: metabolic syndrome, also known as insulin resistance. Dr. Lustig suggests calling it “processed-food disease.” I like the name carbohydrate intolerance, myself. Fortunately, we know what the root cause is, and we know that the cure is simple: remove the root cause! 


