Since he’s already been sufficiently neutralized and thoroughly covered elsewhere, we’ll skip Theodore Kaczynski– even though he is certainly more colorful than Robert Kaita. The latter is Principal Research Physicist in the Plasma Physics Laboratory at Princeton University, and a respectable scientist in his own field with a more than respectable publication record. But being an expert in one field is no guarantee of any deep understanding of science in general but apparently, for some, a source of arrogance. Kaita is also a Fellow of the Discovery Institute’s Center for Science and Culture, and a proponent (or at least defender) of Intelligent design creationism; he is for instance a signatory to the Discovery Institute’s petition A Scientific Dissent from Darwinism and contributed to the anthology Mere Creation: Science, Faith & Intelligent Design, edited by Bill Dembski. He was also involved in (unsuccessful) efforts to convince a textbook board in Alabama to adopt the creationist textbook Of Pandas and People – for which he was a reviewer – in 1993.
Diagnosis: Yes, he has genuine – and rather impressive – credentials, and when people with genuine credentials allow ideology to trump intellectual honesty, accuracy and meticulousness, the results are ugly. Kaita is a pseudoscientist more than he is a scientist.