Because they come to the country with no money. At which point they're either dragged into crime or end up working a minimum wage job, not earning enough to move away.
Then their kids grow up and either get dragged into crime or end up working a minimum wage job because the schools in those areas are beyond terrible.
If you grow up in a terrible area, chances are you will never amount to anything. The ones that do are the exceptions.
I (and this won't surprise some of you on here, in terms of the views I present) am a deputy headteacher in an inner city London borough. I have taught in these areas for the last 15 years. There are some ineffective schools in these areas, granted. However, the majority of schools in London add much more value to a child's education than suburban or rural schools. This is a lot to do with extra funding we received under Labour which enabled us to work closely with the community, parents, businesses, youth organisations etc. This money has now been removed. However, we will continue to plough our resources into it as it makes a difference. But, once a child reaches 12 or 13, the damage is done. It is hard to change someone who has such a negative attitude to authority and their community at this age. It needs to be happening at 7, 8 years old to have an impact in later life. This is why it is important to look at the reasons as they are there staring out at us.
These riots and the looting involved young people of all ethnicities. However, amongst those arrested were university graduates, army applicants, graphic designers...but it's easy for certain sections of the media to blame a certain demographic (the working class) who have been demonised by recent Governments of both parties.
And do you know where the real problem lies? Parents. Parents who are kids themselves, or were not brought up themselves with a sense of value and right and wrong. I am angered on a daily basis when I get a phonecall saying 'my kids' (ie those that attend the school I work at) have misbehaved in the local area or on public transport. It seems it is schools' responsibility to deal with children's behaviour from when they wake to when they fall asleep.
This is why it is not good enough to just say there's no reason for it or it's just kids having no respect anymore. There are root causes and these need to be recognised and addressed.
Anyway, I can't contribute anymore to this discussion as minds are not going to be changed. Plus I'm off to France tomorrow with my wife and kids. Stay safe all.