Well, some quotes from our help pages:
"Registration information
Accurate information is important in case you ever forget your Nickname or password. We will need to confirm your identity using the given email adress.
Nickname and password reminders are only being sent to the registered email adress!
If you have entered any information incorrectly or have forgotten what you entered, we will not be able to remind you of your username or send you a new password. "
Why do you think we ask for an email adress, if I may ask?
As we do not ask any other data at the registration, this is the only way we can identify registered members.
Just think about it, anyone can request to send any password to any email address, as you suggest?
OP