Police shootings in the US rightly provoke enormous outrage. So where’s the outcry over the drowning of hundreds of Africans in the Mediterranean?Following the killings of unarmed men and boys such as Trayvon Martin, Tamir Rice, Eric Garner and Walter Scott, the United States is entering what’s being called a new civil rights movement, with activists ensuring that the world now knows about the ongoing onslaught against black life.Movements such as #BlackLivesMatter have been huge in their reach, spreading far beyond the US and capturing the imaginations of people of all colours and nationalities.