The problem is, nobody wants to wear glasses, even people who need them for vision correction. That's why contacts were invented, and laser vision correction. So why, oh why, would we ditch glasses, only to wear different glasses.
Because normal glasses imply that your eyes are faulty and people don't like announcing thier flaws in such an obvious way if they could help it. Because normal glasses imply you do a little bit too much book readin', so you obviously need to be picked on. Conversely, Google Glass doesn't try to correct a physical impairment you have, so it isn't really a fair comparison.
If you think the purpose of a demonstration/event is "nude tits for the onlookers", you're a moron whose thought centre has moved from cranium to crotch.
The purpose of a demonstration/event is to advertise a product and create interest in said product. There's a reason people say "sex sells," and commercials always have sexy, or at least attractive, actresses in them. Maybe you should do some research about advertising, specifically sex in advertising, before you call someone else a moron, moron.
Because Fuck You. That's why.
As with how many licks it takes to get to the center of a Tootsie-Roll Pop, the world may never know.
Free speech is letting others criticize you,
That's a very specific, contrived, and useless definition for free speech you have there.