First things first: THIS IS NOT EXILE. These people are being denied the right to enter a country they are not already in, not being kicked out of it. Exile is illegal in the UK, and if any government tries to push through anything that changes this, they will be swiftly reminded that those being exiled will become illegal immigrants in another country. And before you say it, deportation is not exile, exile is being forcibly removed from your native land, or the one you happen to have citizenship in.
Second, contrary to popular belief, the slope is not that slippery. In fact, the slope has a mu of 0.99 (sorry, mechanics reference). Sure, this is indeed a form of censorship. Are you suggesting that all censorship be removed? In which case, I'm pretty sure the watershed would have to go, and your poor children would be exposed to all kinds of filth.
Third, have you seen British comedy? We poke fun at every nation, ethnic group or stereotype within our grasp, and of course, ourselves too. With that in mind, to be censored in the UK you have to have said something pretty horrendous (or be a muslim, whichever).
Oh yes, and freedom of speech? Darling, we may have freedom of the press, but freedom of speech is quite a different matter. And yes, we are so weak-willed as to be persuaded by mere words. But you are too. Don't tell me you've never been persuaded by an advert. And don't tell me there isn't still indoctrination in the Bible Belt, because there is. There's indoctrination in Britain too, it's called faith schools, and when I am Prime Minister they will be the first thing to go.
Oh, and you lot don't even have freedom of speech either, how easy is it to be unpatriotic? At least Britain gets to keep one form of freedom: the right to self-loathing.