This sounds like a claim that rationality is hopeless.
Here is what he said prior to making the statement I quoted (to give you some context):
Take historical analogies. I believe that historical analogies are always wrong. This a long discussion, but, to me, the most dangerous thing about Chamberlain’s capitulation to Hitler at Munich is not the fact that Munich happened and it led to further Nazi aggression and so on and so forth, but that the example of Munich has been used to support thousands upon thousands of bad policies and inappropriate decisions. LeMay called JFK’s recommendation for a “quarantine”...
This is our monthly thread for collecting these little gems and pearls of wisdom, rationality-related quotes you've seen recently, or had stored in your quotesfile for ages, and which might be handy to link to in one of our discussions.