Why?
Because they send your passwords to your email address, when you register on the site. This is despite the fact that if you forget your password, they can reset them and send you a new one to your email.
For a website to send passwords to your email upon registration is a dangerous thing because people typically re-use old passwords for website registration, so copies of their passwords on emails can be found in inboxes – and they typically only get there because of registration sites. I can’t think of any other way in which a password would get sent to an email, but you can help me here.
This is a good thing for identity thieves, bad for most other people.
I also don’t understand why new members to the Ergonomics Society aren’t automatically registered to the website and are sent an introductory email. I’ve had to register on the website separately. That’s just dumb.