Antibiotics "cure" you of your current infection. And we have have "cured" polio, chicken pox, diphtheria, malaria, measles (mostly...some coming from Mexico), pertussis, tetanus, typhoid fever, yellow fever, smallpox, rabies, whooping cough, etc., etc.. Modern medicine & drugs have saved millions of lives...I am just not ready to jump on the "they are intentionally withholding research into cures" conspiracy train just yet. I didn't get on the "100 mpg carburetor withheld by big oil" train either, or the "Qanon" train recently. Heart disease and stroke (top killers) have unique (non-bacteria or virus) risk factors (diet, etc.) that are not easily "cured". Average lifespan increasing from 47 years to 76 years from 1900 to 1998 speaks well of modern medicine, drugs and sanitation.
Antibiotics are losing efficacy, unfortunately, but still beat back numerous infections and cure them.
Sanitation (hygiene), better diet, better
preventative medicine, including earlier diagnoses (primarily technology driven), and vaccines.
We didn't
cure polio, for instance, we
prevented people from getting it and the virus pretty much died out for lack of viable hosts.) People who got polio still had a rough run and suffered debilitation from it.
Our abilities to prevent disease, address chronic conditions earlier through better detection methods, and treat cancer, for instance, again because of better detection and a better informed patient base, have improved.
But while we have life prolonging treatments, while we can prevent some diseases, and reduce risk factors for others, we still can't cure these once people get them. If you could address (and cure) the root cause of high blood pressure, or excessive clotting (DVT/PE) rather than give drugs which remedied the problem, then we would have cured it. If, with a single treatment we could cause tumors to shrink and disappear, we'd have cured them. We hack them out, irradiate and fill the patient with chemicals, but we don't cure it yet.
We have a long way to go curing (not preventing, but curing) viral illnesses, and have barely scratched the surface when it comes to mycoplasm caused disorders. In the meantime, we're treading water with the bacteria, just keeping ahead of their adaptations to antibiotic therapy.