Fine. This AAR is admirable in my book.
Among other things, it dispells the myth that anybody "stomped on the rudder". Heck, they did controlled experiments and none of the test pilots were able to get anything other than no or full deflection on the pedals at that speed.
If you want to know why the rudder control system is a bad design, read this thread from the beginning, or read the AAR.
If you insist it's pilot error, then you'll be forced to explain why several other pilots committed similar errors; and if an error is so routine, why did this manufacturer not act to prevent a catastrophe?
everyone makes mistakes. We've seen many times that even the best flight crews screw up. But this isn't one of those cases.
(oh yeah, and as for the free rudder: principle of parsimony (aka ockham's razor or the tinfoil hat-wearer's enemy) -- don't posit more beings than necessary to explain the phenomena).