He definitely pushed that war and thus has some responsibility for the consequences. I do not wish him ill will and it is unfortunate that he is dying of cancer, it is a loss for his friends and family. That said, just because he is dying does not make him a saint nor do I have to pretend he is one, he clearly wasn't.
(Liberal-minded americans downvoting this: please think twice. Not everything that seems to go against your instincts is downvote-worthy if you don't know the details. In this case the details matter.)
Please don't be so 1-dimensional.
I remember this particular period relatively clearly. There was intense debate everywhere, it was the most polarizing issue for a very, very long time. I was on the dove-side of the debate. I remember having some extremely heated debates with "hawks" (all online - these hawks somehow just disappeared after the invasion when it it got more and more obvious that there actually were no WMDs...).