Terrorism tends to happen in clusters, you can refer to school shootings for example. No one is claiming immigration policy of this millennia doesn’t have its problems. I don’t know if you are German or why this issue is so close to your heart, but they have a new chancellor (in free nations people choose their leaders) and it looks like the direction is changing quickly regarding many crucial issues. In the US rapes per year north of 120k, in Germany 11k just for a reference (ref. Statista reported cases).