Reasons why Michael Crichton was a jerk:
He wrote entire essays about straw men: http://www.michaelcrichton.net/speech-environmentalismaseligion.html
He plays with the scale on graphs to exaggerate his opponent's claims and minimize his own claims: http://www.michaelcrichton.net/speech-ourenvironmentalfuture.html
He combated the popular idea of global warming instead of promoting the scientific evidence. (Except where he employed false evidence: [1])
He stifled public debate by not allowing any reproduction of his speeches without copyright permission.