In this particular case it doesn't seem too bad. Someone's name and address are not (or should not be) particularly sensitive information. Passwords are, and that's why best practices only keep a one-way function of the password ("encrypted" implies that it can be decrypted to plaintext, which should not be the case).
Luckily you can sign up for Quora with any name and email. You have to assume that no matter how hard a site tries to protect your info, it will get compromised sooner or later. The best they can do is what Quora does: demand as little info about you as they need.
