In relation to racism and violence, exactly the same things were being said ahead of Euro 2012 in Ukraine where they have proper Nazis (who are now in government, with British and US support), I remember Sol Campbell on Panorama saying people shouldn't go there.
After what Boris Johnson has said, and the timing of the expulsions a day after the shopping center fire, it probably would be a bad idea for English fans to go there now. I doubt supporters of any other nation will be attacked aside from Germany, but it's always the same countries that cause trouble at all tournaments and this one won't be any different. We clearly still have a problem, see Amsterdam.