Full disclosure: I haven't read TFA. Is it remarkable that Hemingway was convinced? I can understand if I was a 'mundane' person and thought somebody was spyin

Full disclosure: I haven't read TFA. Is it remarkable that Hemingway was convinced? I can understand if I was a 'mundane' person and thought somebody was spying on me, I could be convinced that I was paranoid. But if I have ties to one of the obvious enemies of the US, I think it would be very hard to convince me that I _wasn't_ being spied on because the motive seems obvious. Do we know why Hemingway was able to be convinced?