A rationalist has a hard time not reviewing history from that period and concluding that for all intents and purposes McCarthy was right about the extent of communist infiltration and may have indeed grossly underestimated and misunderstood the nature of intellectual sympathies for communism and how deeply rooted those sources of sympathy where in American elite intellectual tradition.
My impression of the situation (which has not been extensively researched) is that, although there really were plenty of spies and such, McCarthy's methods were largely ineffective at identifying them. Is my impression accurate?
I would agree with your impression.
I have found this most wonderful (if fairly lengthy) article, and thought you would enjoy having it brought to your attention.
It is so good, I think we should include it among the references in the "Politics is the Mind Killer" wiki page. But, before that, I submit it to you, and ask you: is there anything in this article that would warrant its exclusion from this site? I mean, besides the fact that it is about politics, and written by a notorious Social-democrat (And is that in itself grounds for exclusion?).