support of AGW can't be attributed solely to stupidity.
This is where we disagree -- I don't think stupidity was ever involved. They knew exactly what they were doing from day one. It's simple:
1.) Set in concrete your preordained conclusion.
2.) Ignore any facts that don't support the conclusion, if those facts cannot be manipulated so that they appear to support the conclusion. Make up "facts" and "data" out of thin air, even.
3.) Never change the conclusion. Cling to it, never let them see you sweat. Vigorously defend all data, no matter how corrupt, that supports the conclusion. Dismiss and/or marginalize all naysayers. Destroy them financially if necessary. Hell, KILL them if necessary.
That's all it is.