The problem has become worse given the current options available to the forum's staff members.
Before 2011, the forum had a 3 Strikes system where the first instance of toxic/intolerable behavior would earn a member a one-week temporary suspension; the second instance, a month-long temporary suspension; and if they came back after that still acting in the same untenable manner, they would be permanently banned.
So what happened in 2011 to make such a successful system no longer feasible? Simple, the forum got Facebook-ized. Yep, that was when the forum adopted the "Like/Unlike" link at the bottom of every post; along with the new membership ranks, trophy points, and a list of people's names at the bottom of the forum's main page. The only time a mod can deal with troublesome members is in their first month of membership, and often a member account stays blank with 0 posts so a judgment can't be made either way. Either that, or multiples are created long after the member's first month has elapsed. Honestly, I'd appreciate it if staff members had member-banning powers available to them at all times, but it is what it is for now.