Police question three men in murder people

This article talking about a murder that happend the last week end in Peterborough (an area in Cambridge where are a lot of social accomodations). A twenty-five years old men from poland was beatten and kicked until the death.
Policemen arrested three young people the last monday, they are all between eighteen and ninteen years old.
the Polish was coming back home to a barbecue with his family chen he was attacked by the murderer. We don't really know why, is a racial question or only young people who needed violence? At the end of the article, his family call for witnesses.
The article doesn't talk about the local resident but we can supose that they don't feel safe in their neibourghood. I think this kind of situations are very striking, and infortunatly, happens very often. It happen the most part of time in underprivileged area. I think it is a big problem of society and that is why this subject could interest everyone and not juste local people. Is it a problem due to the government, how and what the government can do to reduce this kind of incident, or is it just a pproblem of education?
I think that this violence show us a deep problem in actual societies.