Even decent and intelligent people can be fooled
Absolutely, but I am still left wondering "How!?"
The story we have is that the verification was done on a computer which one of CSW's associates "purchased" that day. Why? Why could they not use the computer Andresen had with him? A "factory seal" proves absolutely nothing. There is no way Gavin does not know this. Even one of the largest hardware wallet manufacturers - Ledger - does not use tamper proof seals because they prove nothing. They did not verify the copy of Electrum they installed on this computer. This is "Basic usage 101". There are probably over ten thousand posts on this forum telling newbies to verify Electrum before using it. But Andresen of all people didn't know to do this? I just don't buy it. And then he wasn't allowed to keep the laptop or the USB drive afterwards? This is like a magician who refuses to let you examine his obviously rigged deck of cards.
There are just so many flaws in this set up that I don't understand how someone with Gavin's knowledge fell for it.