Now in normal circumstances, when people decided to engage in criminal acts like rape, the police would handle it. But it seems that they are understaffed and under-prepared to handle individuals of this nature, who have no respect at all for the law of the land and will assault police when cornered
Collateral Damage: Germany’s Migrant Crisis
Rachel Edwards

It’s because Germany is a nice, generally extremely safe place. They haven’t needed this for decades. It’s a hard skill to pick up again.