Yep. I'm one of those who signed.This CRU dump just adds more credence to their position.
Running with the herd doesn't mean you are going in the right direction.
I can't speak for all who signed, but integrity still means something to us. Junk science reflects badly upon us all.
I know I'm not the sharpest knife in the drawer, I have no letters or honours appended to my name. I, and millions more, are a part of the herd, and we rely on qualified, verified, honest, leadership to ensure we're headed in the right direction. Our society has developed many methods of sensing the truthfulness of the data we're given, and the scientific method of peer reviewed, repeatable results of verified data is a major one. What Mann et al did is the equivalent in my view to scientific genocide - they purposely modified or created the data to provide a fore-ordained (by them) result. They purposely denigrated, derided, and shut out anyone who didn't follow their lead or questioned their results; destroyed the data contrary to their precepts, and made any peer-review of their findings unavailable or unreachable.
If that is true, then they should be stripped of any position and titles they hold including their educational certificates, and put in solitary confinement until they die. Take from them what they crave most - the adoration of those around them, and let them stew in their own pitiful self-worth.