I reckon that those who are most vocal are the people in regions that have been subject to high levels of immigration. Where I live has had an increasing amount of immigrants in recent years, but I suppose at least they are from nations not famed for extremism or nutters. There's not really any social friction, and I've always lived around Sikhs/Hindus who have integrated well.
If I had been living in Luton for the past 50 years, I might be leaning more towards the DirtyDog wagon. I sometimes wonder if many people who say that the immigration issue is a myth are those living in areas where their next door neighbours are several hundred yards away...
I do agree that we shouldn't pander to minorities. We are a modern, tolerant society but I must admit that it annoys me when we bend over backwards to whichever tiny group shouts the loudest...

I can't remember when Buddhists, Hindus, Sikhs, Jews and Taoists last started kicking up a stink wanting their own courts and so forth (unless I missed something). I work with a few Muslim guys who are pretty westernised actually, and it does puzzle me why the loony minority can't just put up or move away to a country that works the way they want it to.