But the future of tolerance and multiculturalism in Europe is far from bleak. The bigotry on view has been carried out by a fringe minority, cast all the more in the shade by the huge peace marches and vigils that followed the deadly attacks. And some communities are trying to build solidarity in their home towns and cities.
One group of Muslims in Norway plans to form a "ring of peace" around a synagogue in Oslo on Saturday. On a Facebook page promoting the event, the group explained its motivations. Here's a translated version of the invite:
Islam is about protecting our brothers and sisters, regardless of which religion they belong to. Islam is about rising above hate and never sinking to the same level as the haters. Islam is about defending each other. Muslims want to show that we deeply deplore all types of hatred of Jews, and that we are there to support them. We will therefore create a human ring around the synagogue on Saturday 21 February. Encourage everyone to come!
According to the Times of Israel, Ervin Kohn, a leader of Oslo's small Jewish community, had agreed to allowing the event on the condition that more than 30 people show up — a small gathering would make the effort look "counter-productive," Kohn said. Close to 1,000 people have indicated on Facebook that they will attend.
"We think that after the terrorist attacks in Copenhagen, it is the perfect time for us Muslims to distance ourselves from the harassment of Jews that is happening," 17-year-old event organizer Hajrad Arshad said in an interview with Norwegian television.
"If someone wants to attack the synagogue, they need to step over us first," posted another of the event's organizers on Facebook.