Hey. Many opponents of the current government attribute Britain's increased threat to its role in the war in terror. In the case of Iraq in particular, it is implied that this situation is Blair's fault. Maybe that is true, I don't know enough to make comment. However, the war in Afghanistan was widely supported by the United Nations (it still is) and our forces are there by mandate.
Would Blair's opponents be attacking him so passionately if we had only got involved in Afghanistan? Who is to say that these mad bombers would not still feel justified in their actions over the Afghanistan issue alone? Is that not where their hero, Bin laden, was hiding while issuing threats of retaliation for the fall of the Taliban?
At the end of the day, nobody can say either way, but I think it is worth considering at least.