Why do US cops keep killing unarmed black men?

Why is George Floyd the latest in a long line of unarmed black men killed by US police? Studies show black men are three times more likely to be killed by police in America than white people.

With Helena Merriman.

(A man speaks into a bullhorn as demonstrators march in Los Angeles, California. 2 June 2020. Brent Stirton/Getty Images)