Multiculturalism and the Evil Other

Of course multiculturalism to some extent has nothing as its opposite but the extreme ideologies. These is actually a remarkable solution to the problem of every ideology upto the point where it comes to being. Namely the problem of the need for the perfect Evil Other to vilify, scapegoat and so on a certain social group for the false edification of the position of the ideology for its proponents.
Ideologies up to that point came along with a suffocating inescapability - the image of the other as evil was there in every ideology.
In multiculturalism every ideology is included and accepted as equal. Diversification comes out to enrich the society and the society does become more flexible.  Adherence to a standard or a rule defined by a person in position of power has suddenly become a poor competitor. At one point it develops to a point to overcome resistance to extreme ideologies. Is the result a catastrophy, falsification of the idea of multiculturalism or even a need for something other? One final proposition: multiculturalism begins to fade when the Evil Other resurfaces (as terrorism of course).