It's a good move to address this out in the open. No organization is completely immune to this kind of problem. However, maybe it's not a bad idea to think about what controls should be implemented to prevent a repeat of this unfortunate event.
I read a good deal of the thread in question. I'm not an attorney, but should you have legitimate concerns about vicarious liability?
You bring up a good point. This issue was one of the reasons that the Network was created. However, since this occured before the Network existed and before there was the ability to discuss and implement controls, we have all had an unfortunate learning experience, one that is informing the structure of the Network and its potential relationships with the chapters.