Authentication != encryption. Another point raised in that discussion is that an SSL certificate only proves that you're on the site that the URL says you're on; a link could point you to
www.еmаіІdіѕсuѕѕіоnѕ.соm and you wouldn't know (from the URL or the certificate) that it isn't this site (apart from the "w", "m", "d" and "." characters, all the characters in that link are Cyrillic; goodness knows where, if anywhere, that link leads).