It's already hard enough to get people to understand how URLs work, QR codes really don't help. Certainly it's in the best interest of corporations to scan codes in emails for security purposes, but I think it's on QR code reader producers (e.g. Apple via iOS camera) to make the concept safer somehow. I'd also really like to see well meaning people, like restaurants, create codes that do not use redirects or any other trickery and to have the link written out for the rightfully paranoid. And paper menus would be cool too...