Had Google just produced Glass, and harm resulted from misuse outside of their control, it wouldn’t be reasonable to ascribe much blame to them. But to actively fight against clear, valid safety concerns makes them an accomplice — morally, if not legally.
I actually hadn’t thought about what Google was really doing until I read this bit from Marco. When it comes right down to it, there’s little difference between having a cell phone mounted in front of your eye, and Google Glass when you are driving. Both will be equally dangerous — so if you think Google Glass should be allowed, you too should be fine with people texting while they drive.