I also blame the modern business culture more, but we shouldn't act like McCulloch and Pitts were innocent. They well could have introduced neural nets without making the wild claims they did about actual neural equivalence. They are largely responsible for much of the brain = computer naivety and, in my view, they put forward this claim with shockingly little justification. The reasoned analogically without actually understanding the things they were trying to analogize. They basically took something that had the status of hypothesis at best and used it in the same manner one might if one had understanding.

To be clear, I'm not at all criticizing their technical contribution. Neural nets obviously are an important technical approach to computation—however we should criticize the attendant philosophical and neurological and biological claims they attached to their study, which lacked sufficient justification.