Obviously, if a malicious user could save camera snapshots or streams you have a bigger issue on your hands than improperly lighted selfies. Or do they simply not get this / this isn't as commonly known as the fact that people could turn on the camera but not the little green light?
Why does the user feel more secure by simply taping paper over it. Why don't they shove blu tack in the microphone(s) etc.?
To summarise: why is the experience of opening the screen off putting to some when the camera is pointing directly at them (with no way of independently diverting it)