Indeed. But it happens rarely enough that its usefulness to video chat with friends outweighs the risks for me and many other people. Most people are already okay with a camera on a device that is constantly pointing at them.

I do not have that option with my Macbook, nor do I think people have such an option with most laptops that have an integrated camera and mic. I could physically cover the lens and mic, but you can do that with a Kinect, too.