Of all the things that failed for that leak, we should focus the LEAST on the password being insecure, and the company whom had their account misused, and the most at the other end of the long line of failures.
Why was there no monitoring on a company suddenly looking up 600 people a minute, why was this only discovered when they were making the invoice?? And how was it even possible to have a password that unsafe, no two factor auth etc etc etc.