Patti Murin is a wonderfully talented actress going through an obviously difficult time. I wouldn't want to be in her position after this past week.
That being said, this is the business she's getting herself into. Look at the Internet comments for famous people on a larger scale like Justin Bieber or Kim Kardashian. It's full of nonsense. Horrible people arguing about nothing or about things they know nothing about. Death threats. Extreme judgement. Childish namecalling. Over and over again 24/7 on dozens of social media and press outlets. One message board on one website seems small potatoes to me by comparison.
The issue is that our civility as a culture has degraded, especially online. We can do lots of things to try to change that, but the fact of the matter is that some people will always be bad and they'll move to a new venue. If not here then Reddit, or ATC, or whatever this hypothetical replacement to BWW would be.
All we can do is take responsibility for our own actions and avoid people whose behavior we dislike. As a professional actress, Ms. Murin can either visit websites where her work might be discussed knowing the consequences that come with it or she can avoid them like an adult. Either way, I think she should have more sense than to post a long rambling blog entry about it. Long rambling blog entries never look good on anyone.