I think you're being a tad dramatic about it. I don't think that there are any vendors on here that are "hunting down victims". All I have seen is people who have bad communication skills and lack of business sense. For you to say that they are intentionally trying to attack and hurt people is just as bad as one of them posting in a thread calling you a moron. It is poor communication driven by an illogical, overly emotional response and is completely unprofessional.+1 on reviewing vendors here.
I fully accept that a vendor can have an off day or that a company can have a bad batch of product but the deliberate and repeated abuse that certain vendors have subjected their customers to is completely unacceptable and allowing these vendors to continue using gencoupe.com as a hunting ground for new victims is just as bad.
Before you comment on something like this you need to make sure that you are not contributing to the problem, and yes, irrational attacks without bounds is contributing to the problem.
I'm not going to comment on any particular vendor or thread, and I'm not saying that anyone is blameless in these scenarios, but I do see a lot of people who have no business making comments about a vendor they have never dealt with. Regardless of how unprofessional a vendor might be, if you aren't involved with the topic, you have no right to make any irrational, dramatically emotional judgment call, particularly one that is inflammatory and serves to only invoke even more irrational, dramatically emotional responses.