Please indulge me for a rare (but brief) thread of personal comments.
I was on a city bus in Copenhagen early this morning. A young man clearly suffering from mental illness was screaming angrily. Not an unusual occurrence on urban transport. Passengers ignored him. 1/
Suddenly the man rushed to the front of the bus and began viciously punching and stabbing the driver. A passenger intervened - he disarmed and subdued the man. (Turns out he used to be a police officer in Syria.) Two women in hijabs came to the bus driver's aid. /2