My keyboard kryptonite

Maybe people thought there was a use for it when the personal computer was first invented, but one of the greatest mysteries to me today is why computer keyboards continue to be produced with the "Insert" key. Really, what's the point? Unless it's by accident, does anyone use it? I find that it only makes my life miserable, because when I do accidentally hit it without realizing it, I end up typing over all sorts of stuff I've already written, thus making me have to retype everything that's been bulldozed over. For God's sake, why is it there???