I have another theory on that, if you speak to anyone from the older generation they will tell you that in the 50's- early 80's immigrants kept their head down and would try their best to assimilate, they would make no demands for fear of the general public and a backlash. Back then you didn't have women in burkas walking the street, men from pakistan and bangladeshi background hanging around schools trying to groom underage girls and terrorism as part and parcel of city life. Then came the PC culture and the multicultural agenda and the co-ordanited effort of the government, the media and the education industry to re-educate the general public into changing British culture to conform with foriegn values, or tolerence and diversity as they like to call it. After that the most preditory people that come from the most preditory cultures used this new found tolerence as a weakness and exploited it. Until we now have a foriegn religion dictating to the general public what you are allowed to say, see and hear and who is allowed to enter the UK.
The Satanic verses protests were the tipping point, enlightened society bent over in the face of medeaval blasphemy laws from an alien religion. The actual fact that if I wrote that last sentence on the guardian comments section I would be either deleted or lambasted, tells you all you need to know. People there would say I was racist or Islamaphobic for stating that Islam is not British, it never is, never was, until people were brainwashed into pretending it is compatable with a western society since the 80's. Now it's commonplace for people to identify as British Muslim, which basically means I was born in Britian but obey a different set of laws.
While I don't think it fair to just call anyone with brown skin "paki," or smash up their business or intimidate them on the street as happened up to the 80's. I do think that any reasonable immigrant going to any country should try their best to respect and intergrate into that countries existing culture, not start dictating terms for that country to comply with the same backward ideals that caused their own countries to become such shitholes they had to flee from.
I have an Egyptian friend here who came to europe legaly to escape the rising intolerence in Egypt, gets on well with everyone and is just a generally good bloke who is an asset to the UK. But he loses his charm to the leftists when they realise he is a Coptic Christian and he talks smack about Islam from his own personal experience of persecution. It's really funny to watch these left wing nutbags eyes light up when they are sharing a conversation with a brown skinned Egyptian, assuming he's a muslim, it's like some sort of odd fetish for them, like petting a exotic animal, that they can tell their friends about later on...
...But then you see all of their patronising fawning over him dissapear as soon as he talks smack about Islam and they realise he's just a persecuted Christian. Their expessions change from glossy eyed rapture to puzzlement to dissapointment then to anger at being duped and then they either lose all intrest in him or try to argue that he is somehow in a position of power over Muslim Egyptians:D And then they say his skin is not really brown but more "Italian." It's hillarious to watch the mental gymnastics playing out on their faces in real time, it's like watching a silent movie:D
I just thought I'd share that last story with you all to show that people don't bend over backwards for immigrants due to any compassion of their plight, they do it because they have been brainwashed into buying into the idea of the noble poor savage that they can raise up and brag to their friends about. The patronising racism of low expectations where everyone is a victim and has to be excused because the colour of their skin makes them oppressed in perpetuity.