It would in cases where there wasn't an _intentional_ attack. If I accidentally sent a log in email to my Mom, and she clicked it, odds are she wouldn't know wh

It would in cases where there wasn't an _intentional_ attack. If I accidentally sent a log in email to my Mom, and she clicked it, odds are she wouldn't know what was going on: there is no challenge screen asking for a new password. She's just see my account.