Imagine the S7 fiasco, but because of a wave of popular knock-off batteries. Technically, Samsung wouldn't have done anything wrong, because the batteries are at fault, but Samsung's name would be the one most smeared in the sensational news stories about the exploding phones.
Any time someone has their phone out, whether it appears they are talking on it or just txt'ing, they could be recording. It would be trivial for me to fake a common phone task, but actually be recording video of anything in the bar. Yet, no one confronts me just because I have my phone out. There really is no rational reason for people to treat those with Glass any differently than anyone who doesn't have their phone in their pocket.
"In the face of entropy and nothingness, you kind of have to pretend it's not there if you want to keep writing good code." -- Karl Lehenbauer