CBS' quick guide to ignoring the problem
1) Insist the only problem is a very specific behaviour, and only a minority are responsible. There are many ways to achieve this, you could convince yourself that the problem is isolated to a seperate and different group called 'extremists' and then, without knowing how many people actually do it, tell yourself only a tiny minority of people do it.
2) Insist its not an issue, despite the fact that you feel the urgent need to tell people its not an issue frequently. This can include dismissing growing political power by suggesting its a measure of equality, by comparing the growing political presence to something you're already comfortable with. For example, if Hizb-ut-Tahir bother you, pretend they're comparable to the Green party. The Greens are no threat, ho ho ho!
3) Legitimise the actions of those we fear. This is the more complex denial mechanism, not for the inexperienced. Ways of doing this include justifying violence against civilians due to the foreign policy of our allies, claiming that violence and hatred directed against us are the result of us not meeting moral standards such as equality or anti-racism.
4) Just pull your covers back over your head and go back to sleep. Hope someone else will deal with it while you pontificate or put your morals first.