Rubbing alcohol is useful for a whole lot. Obviously, there's the whole sanitization thing that's responsible for saving countless lives all over the world. Prior to that, folks were pretty much just YOLO-ing surgeries and hoping our bodies can fight off whatever bacteria and fungi were trying to kill us.
And if you wanted to clean ink stains, remove stickers, clean jewelry, heck even defrost windshields, deodorize your shoes, or make ice packs, you could do all of that with good old rubbing alcohol.