I think it's safe to say if someone was going to intentionally attack a Google self-driving car, say to hack it and direct it at a target, they'd bother to make a basic attempt to counteract the cameras. Something like those glasses with infrared lights that blind surveillance cams? Put some near your license plates as well perhaps, I don't know.

Not that I agree with the parent this is likely, but most of the replies here seem to ignore that technology is pretty easy to mitigate if you know what you're up against.