Whatever the motives of the direct perpetrators of the crime actually are, its consequences will increase the tension, anxiety, and disorientation in German society.
They will be easier to manipulate, using the threat of Islamic terrorism and neo-Nazism, including being manipulated from the outside. In general, the attack tends to weaken confidence in Europe and its peoples in their leaders.

In turn, the indigenous Germans are radicalized in response to this aggression from invaders. By promoting the ideology of tolerance, the ruling Liberals in the EU only provoke Islamists and indulge them, at the same time pushing indigenous Europeans into radicalism.

http://katehon.com/article/another-blow-continental-europe