Can I just reiterate - this is a fairly isolated incident and is
NOT a cause for panic.
All forums have these problems from time to time, and this forum gets far less of it than every other site I have owned. We're not about to descend into troll Hell here. One of the tricky parts about forum management is making calls about these people - you cannot accuse people of things without proof, but likewise you have to put your members first. It's a balancing act, but not one we have to contend with regularly at all. Some surprisingly popular forums on the web are overrun with trolls. We've had a handful in five years - trust me, we're doing very well

I'll make a decision for the long term good of the forum, and I am giving it due consideration. Obviously, as Phil said, it would cause a downturn in traffic. It will also impact on admin time and bandwidth/storage in terms of the probable upsurge in 'registered lurkers' or 'one-visit' users - every account created takes up space on the server, and a swathe of users registering then not using accounts is a waste of bandwidth.
As I also said, however, you should
always be mindful of what you post online - if you're not comfortable with people seeing what you write and you know the site isn't private, use PM functions etc. Safety is obviously one of our key priorities here, but everyone has to take responsibility for themselves also x