I have a lot of sympathy for this kind of explanation, simply because I’m temperamentally conservative. I think it’s very hard for people to change once they are set, and so the formative experiences of a generation have a lasting political and intellectual impact. Intellectually, the children of the Bush Administration on the right are a lost generation. They may grow in wisdom, chastened by experience, but this will come at a price of lost confidence; or they may retain their confidence, but this will come at the greater price of never attaining wisdom.The last explanation is the only when then can explain the "why now" well. But there is another development--the ironic impact of media dominance. While Rush Limbaugh and talk radio have been around for a while, it seems that he has become more powerful of late, in his effort to exclude "deviant" Republicans from the party. Likewise (if my impression is correct since I cannot stomach it), Fox News may have been presenting a more strident, narrow variant of conservativism. Together, these two forces have made it very hard for reasoned debate to exist within the GOP.
An open mind seeks wisdom, first and last.
Perhaps I am wrong as I do not listen nor watch to this stuff, so perhaps these guys can and do encourage thoughtful discussions of different ideas of how to be a good conservative. Yeah, right.