A multicultural society isn't the same as a multiethnic society.
The issue is, a lot of the values held in Islam aren't really very compatable with western values, and vice versa. Promiscuoty, alcohol, casual sex, gender equality all of these things are seen as standard by western people.
Islam is against these things. And I can see why certain people living in Islamic countries are appalled by some aspects of our culture. But the issue begins when you have (I can try and find the video if you reallllllyyyyyy insist) Muslims who are trying to override the country and advocate things like Sharia law.
As an English athiest, this frightens me. I don't like those proposals. So that's why many have a geneal dislike to ISLAM (not all Muslims, not all brown people, not all foreigners).
Why are different assumptions made for Muslim terrorists than white terrorists, in my humble opinion?
Well, when a white person commits an act of terrorism, unless they themselves do have like some weird anarcho-revolutionary agenda, we don't assume that they're doing it to cause changes.
After all, terrorism is using acts of violence to spur change in society, right?
But when Muslims do it, they have the ideology behind them. The same ideology that lots of westerners feel threaten their way of living. It's more worrying when these terrorists do it "in the name of Islam" as there's lots of Muslims in our country. That's why Islamic terrorism seems much more threataning in my opinion, as these aren't one off events that aren't supported by members of the community (I mean, I guess some neo-Nazi folks may have celebrated when that guy ran into a bunch of Muslims outside a Mosque last year-ish).
Sure, there are neo-Nazis, but they're not as much as a threat. There's such a small number of them. But what if all the Muslims decided they wanted changes, they wanted Sharia, and they didn't care how they'd get it? It's scary sounding, right?
So what do I want to happen?
I'd just really love it if people from other cutures could actually integrate, and if they don't like our culture then they can leave. The west is a place where: women, LGBT people and non-Muslims are supposed to have liberty and freedom. 2 of the Muslim friends I work with are really amazing. They don't have a seething hatred for white people and western society; they get involved in Christmas decorating and all that fun stuff (and thus in turn we always celebrate their religious events, it's only fair after all), they don't hate gays or women. Yep, they're great.
But I can't say the same for the hordes of wannabe-revolutionists in London who are trying to "conquer" our land.
:3