It's hard to predict the behavior of something smarter than you

Actually, predicting the behaviour of a superintelligence is a pretty trivial engineering feat - provided you are prepared to make it act a little bit more slowly.

Just get another agent to intercept all its motor outputs, delay them, and then print them all out all a little bit before they will be perfomed. Presto: a prediction of what the machine is about to do. Humans could use those predictions to veto the proposed actions - if they so chose.

You can't control what you can't predict,

Humans can't predict what Deep Blue will do - but they can turn it off.

I think your argument collapses around about here.