Most German's responded to the Kristillnacht passively. Many people of the public turned the other way and put the thought of the anti-Semitism out of their mind and focused on the good that Hitler was doing to the country and the "progress". However, since Andre and his family were against this they fled from Germany.
If I were living in Germany at the time I most likely wouldn't stand up against the Nazi's blatantly, as I'd just get killed myself without any progress. However, instead I'd do something to Andre and his family and flee Germany. If I retaliated against Germany, most of the public alone would put shame on me, let alone the Government. Instead of watching the prosecution of Jews I would leave the country. My decision would probably result in me missing all me friends, and many would disagree with my actions as they would think that I'd miss all the "progress".
'You need to sacrifice things to get results.' That quote isn't always true...