Who let them in?

Actually, we know who let in more than 1 million last year, and will let in another 250,000 this:

A 16-year-old German-Moroccan national accused of stabbing a police officer in the neck in the city of Hanover has been charged with attempted murder and supporting a foreign terrorist organisation.

Safia S, whose last name was withheld in line with privacy laws, carried out a “martyrdom operation” on behalf of Islamic State at Hanover’s main train station in...