Just remember, Germany in the early 1900s was suffering from a weak economy due to WWI and blamed them on immigrants when really....they were so full of hate that being poor was what was really killing them. And you're wrong, there are quite a few racists in Germany, but they're closeted racists, meaning, they only get mad when a fellow German is attacked by a minority and blaming all minorities. European countries could go very extreme if they feel their economy is doing bad blaming it on ethnic immigrants. Also, I hate to sound so negative, but another mass genocide like the Holocaust could happen again, but in a different way. Instead of a traditional war, it will come in the form of terrorism. If you look at the U.S., terrorism comes in mass shootings in schools, public streets, public venues, etc etc. In the middle east, it's about religion. In Southeast asia, Sub-Saharan Africa, and Latin American countries, there is so much poverty there that anyone can become extreme.