So? With a camera they also have to sort of point it at you. Your second point, the problem is: if someone is wearing glass and talking to you, they can record me in the same way. So Glass will force me to be suspicious of everyone wearing it, and this sucks. Imagine if you were talking with someone and they were holding a camera to your face, but, you know, they said "don't worry, I'm not recording", yet they kept pointing it in your direction. It's pretty unconfortable.