a) They were suicide bombers
b) They were British born
It was only a matter of time that we had our first 'suicide bombings' and with the disillusionment amongst many of the British youth, let alone in ethnic minorities, it provides a easy breeding ground for hate and recruitment. Especially when you have people both preaching/brainwashing them on one hand and racist organisations (such as the BNP) and people doing there best to make them miserable on the other. And I do blame racism as an influencing factor in all of this.
In the UK we've seen far-right and right-wing groups gather membership and support in 'white' communities over the last few years. We've seen race riots start hitting certain cities for the first time in ages (Burnley, Oldham, Bradford...) and immigration/asylum seekers becoming a 'hot' political topic which has not been helped by some of the reporting in the tabloid press or the media in general.
When you are faced with abuse (be it verbal or physical) on almost a daily basis it will often push you further away and help the seeds of hate against those abusing you.
If we want to help prevent terrorism in this country we need desperatly to be able to tackle and wipe out racism in all its forms.
We also need to stop giving asylum to extreme fundamentalists who are not even welcome in their own countries who then use Britain to preach hatred against the 'West'. Jeez, if they were at 'home' they would probably face imprisonment or execution but we give them a sanction and they use it to condemn us. My feeling is that extreme fundamentalists should be deported back to their country of origin. Even if they face being met at the airport upon arrival, arrested, and face sentencing appropriate to the countries laws. You can't expect asylum in a country you are continually attacking and raising hatred against. Obviously this is a handful of cases and not anywhere near the vast majority of immigrants that find shelter and employment in the UK or Europe.