Grabbing expensive hardware off someone's face? Grabbing glasses off someone who's paying attention to you is hard. They instinctively lean back and put their hands up to block. Anyway, police would just order the person to hand over the glasses.
Federal agents conducting a (probably unrecorded) private interview for hours in a mall? They'd have to arrest him before that.
Someone named Bob Hope from "the Movie Association"? Parents don't name their children after celebrities, and Bob Hope has been famous for three-quarters of a century.
And getting a non-apology and some lame movie passes after being wrongly detained for hours? This makes no sense.
A crazy street dude once snatched my glasses off my face on a street corner. I had been firmly ignoring his ranting and personal space invasion, so I wasn't prepared to take action. It's not that improbable if the victim isn't expecting it and doesn't have excellent reflexes.
I told him very loudly to give them back, and he suddenly noticed that I had about 8 inches and 150 pounds on him and handed them back without a word.
You could be right. Maybe he had poor reflexes or was startled by the badge or something. No single detail damns the story, but enough rub me the wrong way to make me suspicious.
I'm aware of the “many details” bias so I'm just saying, either this story is true, or somebody is very good at inventing fictional stories about problems with Google Glass. I don't really see the point of the second option, so I'm sticking with the former.