Maybe those pictures did radicalise people. However, in the real world things very rarely work in such a cause and effect manner. The social process of a British Muslim becoming a jihadist/Quitdist/salafist etc isn't quite a simple as reading a particularly harrowing edition of the Independent. For example, some of the 7/7 bombers were pushed towards radical Islam by the perception that the West stood by as Muslims were massacred in Bosnia. Social factors also play a big role in radicalising people - many Muslim communities that have seen radicals emerge are very conservative, run by traditions imported from the villages where many emigrated from decades before. Young people, faced with archiac rules and community leaders have looked for more modern role models, which often come from radical preachers. Again, I think I'm right in saying that one of the 7/7 bombers was estranged from his family becuase he wanted to marry an African woman - his traditional family wanted him to marry someone whose family coudl be traced back to the village they originally came from. Radical Muslims are many things but they are cut off from the partiality of customs - all races are welcome, as witnessed by the different racial backgrounds of British Muslims who have committed, or attempted to committ, terrorist attacks.