They need to feel significant. Important. Useful. Worthwhile. They lack the spark of imagination or creativity and so all they can do is tear down that which others build. It is their very best and all they have to offer. If they could do more and contribute more and invent more they would but they can't so they don't and never will. I guess instead of finding them annoying we ought to feel sorry for them. Pity them. Tolerate them. SIGH. I shall give it a try! :)