Whereas I think a public statement of outrage is entirely justified. Take a look at the screenshot. GetSatisfaction has been collecting feedback under the 37signals name for at least a month. Those people who typed messages into GetSatisfaction expecting a response have been disappointed for a while. Anyone who randomly came across that page and saw lots of months-old issues -- but no post from 37signals itself -- has been subliminally convinced that 37signals never gets around to answering their mail.
This is not a theoretical issue. I believe this group of confused visitors includes me. I think I remember clicking through to this page, being puzzled by the lack of back-and-forth, and then surfing away -- not consciously angry, but feeling lost and a bit let down. This incident, and others like it, is not a trivial matter. This sort of thing is costing the company money.
How is 37signals to solve this PR problem, which GetSatisfaction has intentionally inflicted on their company, except by making a big, immediate, loud public fuss? Ideally, this message needs to reach every single person who has ever visited that page on GetSatisfaction.
If GetSatisfaction doesn't want to get into confrontational disagreements, perhaps they should have avoided designing a system that automatically trashes the public image of other companies.