This is a very good piece in the Guardian by Joseph Harker:
“While our media continue to exclude minority voices in general, such lazy racial generalisations are likely to continue. Even the story of a single Asian man acting alone in a sex case made the headlines. As in Derby this month, countless similar cases involving white men go unreported.
We have been here before, of course: in the 1950s, West Indian men were labelled pimps, luring innocent young white girls into prostitution. By the 1970s and 80s they were vilified as muggers and looters. And two years ago, Channel 4 ran stories, again based on a tiny set of data, claiming there was an endemic culture of gang rape in black communities. The victims weren’t white, though, so media interest soon faded. It seems that these stories need to strike terror in the heart of white people for them to really take off.
What is also at play here is the inability of people, when learning about a different culture or race, to distinguish between the aberrations of a tiny minority within that group, and the normal behaviour of a significant section. Some examples are small in number but can be the tip of a much wider problem: eg, knife crime, which is literally the sharp end of a host of problems affecting black communities ranging from family breakdown, to poverty, to low school achievement and social exclusion. “