You don't know what else to say and I don't know what else to tell you. Those people would also be upset if anything else outside of a dot popped up on their display, wouldn't they? Or are they just against dots for some reason? Hardware I/O devices exist for precisely this reason. They literally only exist to be able to control what gets output outside of the OS. Just because you personally never had an OS alert or something else pop-up doesn't mean it's not possible or that it doesn't happen. It does happen, usually unintentionally. That's why we have I/O devices.