I submit that they do care, but that the costs associated with telling people how the penalty system works are higher than the benefits of telling people how the penalty system works.
I agree there Kalium...Google is a company of scale and they think in broad strokes (part of why they are so successful). I don't think I'm asking them to tell us everything about how it works but they managed to create a messaging system with Penguin penalties so what is it about Panda that makes that a harder task? I'm definitely more attached to this than most so I know it might be an anomaly but as someone who is encouraging clients and sites to create the type of content Google wants and values, it's hard to see a site trying to do it right, potentially making mis-steps and being completely lost on what to do next.