Well, I think it's obvious what motivates most of this, at least in London -- Iraq. Beyond that, there deep anti-Western sentiment among young Arab Muslims that, in the many cases I've seen and read about, goes against what most (if not all) people on this list subscribe to -- secular culture. The right to be obscene. Drugs. Booze. Porn. The lot. This has to be faced -- many of these bombers want us dead as well. They are not progressive. Understanding their motivation is the easy part. How to deal with and curtail the wider madness unleashed and stoked by the US, of which these bombings are a part, is much tougher.
Dennis