I am actually German, living in Stockholm, Sweden, for 14 years now. Last year there had been some riots (mainly frustrated, unemployed youth, mixed with some notorious criminals) who started focusing their frustration on the police by throwing stones and burning cars. My own company (a large multinational company based in the US) issued a travel warning for those subburbs of Stockholm. This was very strange reading for me, because I live less than 5km from those subburbs where the riots took place. My own neighborhood was totally quiet!
Statistically the most dangerous place in Stockholm (which is for sure one of the safest cities in Europe!), for example, is not one of those subburbs. It's the central square in the city on a saturday night, were lots of drunken people are present around after the pub visit, who might get in conflict with each other!
For such cases of riots, the normal measures of safety apply: follow the news, don't visit areas were demonstrations happen, avoid large accumulations of people. Those riots are very much focused on small areas.
All western and northern European countries are comparatively save! Remember: here we are not allowed to own guns and use them for self defense, like some other big country in west. That is were I am feeling very unsafe, knowing that every i.... could pull a deadly gun on me, because he feels threatend by me, being 1.71m and 70kg...
What Germany, Sweden and many other countries experience right now is a migration of poor people from the east, mainly Romania, because the state there does not manage to supply it's own citizens with basic welfare. So of course many of them move to the "rich" countries and try to make a living by begging. And of course many of those live on the streets.
So don't be affraid of Germany or the Germans, we are very handsome people with lots of good food, good

, great scenery and fantastic motorcycle roads!