AOG
The problem is - there are some people who will look at this story and attribute the crime to a race (see bazwillrun's comment).
However, if you look at responses to the Baby P story, which was equally horrific, no-one would say, "There's a serious problem with young white men..."
I wouldn't necessarily say the Mail has a racist agenda...but to appeal to the very widest right wing audience, they will regularly publish stories to increase 'click through' and therefore guarantee advertising rates. It has, however, been badly caught out on a number of stories recently (anti-gay, anti-Muslim etc), which they've been pulled up on.