The relativist in me is a little troubled by the one-sided presentation of the historical narrative. I guess that for someone my age or older, it's uncomfortably reminiscent of the hard-line Cold War rhetoric of the hawks of both sides, a division which was crystallised in Berlin. Also, my own personal experience is that one can usually resolve conflicts more effectively by trying to listen to and comprehend both sides; that was true in Northern Ireland, and in the conflicts I have worked on professionally.
But I suspect I am wrong to feel that. The East German dictatorship started life as a puppet regime, imposed by external force, and it maintained order for four decades by imprisoning its people in its own borders, before it collapsed almost accidentally; there was no residual conflict to resolve, just complete defeat. There are limits to the value of trying to understand the other fella's point of view, and this is probably one of those cases. I wasn't there myself, apart from a couple of hours one June day in 1986, and books like this can give one a much better feeling of what it was like to be there at the time; and even more, what it felt like to get away.