I think the correct answer is: "To get GS to make the site look less official/confusing and a bit less insulting".
If that's the goal, which gets their business there faster? A 15 minute phone call or a well-worded 1 hour rant on the blog?
I TOTALLY agree that GS is confusing, especially for novice users. In fact, I'll go farther and say that the changes they are making aren't enough to fix that. They need to change the page titles/descriptions so that they are obviously 3rd party in the SERP.
In short, I agree with the offense. I'm not sure about intent/malice. Because of that, I think the response falls into the self-gratifying torch-and-pitchfork vigilantism that plays so well on the internet. Humanity should be better than that and give companies the benefit of the doubt unless they have obvious malicious intent and/or a track record of evil.
For all we know, a call to GS could've gotten a response of: "Ya know-- we never looked at it that way and have been so darn focused on stuff that I think we didn't see the forest for the trees."