Good Lord, am I out of the loop, some three pages out. Well, to summarise; Islamism is the common denominator for an awful lot of trouble, but it is often ignored and given undue space and privilige. Not particularly good at all. It is, however, a very wide denominator, as well. Not every single person to which it applies is part of the problem, and should be left out of the entire business. There is, after all, wheat and chaff. I think Islamism, and the negative behaviours that are tied to it, should be suppressed and discouraged. I think that it is perfectly warranted to do so. Partly because of the violence, and the risk to the public. Partly because I think it is well within the rights of native citizens in a country to declare that they want and do not want to see introduced.
Further, if we must go down that route, I do believe that drawing a direct comparison between islamophobia and the repression of the Jewish population in Nazi Germany is a ruddy, great simplification. It can be probed further, but it will only become more gauche as it goes.
Now back with the program:
I do not think that multi-culturalism, at its core, is wrong, that it is a bad thing. However, it is also not a good and great thing in an off itself. Further, it happens by itself, all the time. Every now living culture is a result of exchange and growth (frankly speaking, some excellent, some terrible). It carries on, and at its own pace. Indeed, a united England with one shared and cherished culture would likely have been a very strange notion for a bronze age Briton.
However, what rather irritates me is when this ideal of diversity is ham-handedly pushed into places not ready nor willing to accomodate them. One can imagine many of its cosmopolitan preachers, looking at the country-side (quite white and traditional, be it Britain or Bavaria), and thinking "Oh, my, these poor people have never known the joy of diversity, their lives must be a stagnant quagmire!". Then, they believe that a great service has been done to the poor provinsials when a few busloads of uprooted Afghan men is sent for them to manage as they can. That this act alone has enriched them. Meanwhile, the locals are left with a situation they did not want and cannot handle, and the newly arrivals are most likely left to fend for themselves (as always, some of those people are good, some of them are not).
It would no doubt have been an enrichment, had it occured at its own pace. Indeed, worcestershire sauce, chutney and tea are all (in my opinion) great examples of enrichment. Christmas, and most that is a part of it, is another. However, this enrichment ought to not be forced. Multi-culture will come with culture clash, and there will also come the point where one must decide what cultural traits are welcome and which are not.
One can post-pone this decision through cultural relativism, but why would anyone do such a dreadful disservice?