I've always thought that extreme ends of the spectrum were non productive.

There are fanatics in everything in life. From Religion to Sports to Politics, extremists exist.

To answer the question directly, I personally don't care for extremists. They give their respective brethren a bad name by default. This is why I've never understood why Muslims have never really had the outcry you'd expect if you were truly against something as horrible as 9/11 which was perpetrated using your religion's name. I think that's one of the reasons why there is still desention by some towards Muslims as a whole.