While I don't necessarily agree with e-mailing the club in this situation, I do think that there are times when it's helpful to give someone a head's up on a person.
We've all seen cases of abuse and neglect on this forum- I can rattle off a good handful of threads that have exploded due to people starving their dogs, refusing to take them to the vet when they're peeing blood, dropping their dogs off at shelters and getting new ones, etc, etc.
Had the OP given a link to a breeder's website, I probably WOULD have fired off an e-mail to let them know about the situation with her current dogs.
I try to be cautious about how I post. It's sad, but when you're a member of a forum that's very public, you have to be careful.
I used to be a member of a chihuahua forum when Rylie and Chloe were puppies. Anyway, I had plans of spaying Chloe, but I wanted to wait until she was a year old. I posted up a set of pictures of Rylie and Chloe playing together, and Chloe was wearing her heat panties. I had posted up her breeder information in an old thread, and someone must've contacted her breeder to let her know I was "breeding" Chloe. It made me mad at the time (anyone who knew me knew how I felt about breeding from my posts), and now I never share breeder information publicly.