Really interesting ideas here, sun surfer - thank you. And thanks to everyone else too. For a short work it has certainly brought out some good discussion!
For me, I think Zweig means us to have sympathy for Dr B so I don't see him as representing tyrants, though I agree with issybird that he was clearly working for the old, privileged system that had been swept away, so in that he represented them. I think the book is of its time, but no less interesting to read because of that.
And that's a great point, sun surfer: Czentovic can't have been as stupid as we were meant to see him when he was able to read Dr B so well.