Better to remain silent and be thought a fool than to speak and remove all doubt

Why do people think if they talk louder others will understand them better?  Why do people think anything good that has happened was their idea?  Why do those same people think anything bad that has happened was someone elses' fault?  Why do people think if they keep hitting the same button on the copier it will do something different?  Why do people think using a marker board to write down the same words they are speaking will make people pay attention to them?  Why do people think they are the exception to any rule they don't like?  Why do people think if you do the exact same thing but give it a new name it has become something different?  Why do people think if they print something they are reading on the computer it will make more sense to them?  Why do people think their way is the best way?