Well, IMHO they've brought it on themselves. We've had a parade of junk science in the post-WWII era from Ehrlich and Carson right up to this fiasco. And much as I would like to think this was an innocent mistake, the penchant for some leaders of the climate change movement to hide their data and avoid peer review makes me very, very skeptical.
How would it qualify as an honest mistake if Hansen for asll these years has refused to let anyone check his algorythms?