Why emphasize that victims of London bombs were innocent?

Tony Blair pointed out in his press release on July 7th 2005 that the terrorist killed innocent people in the London bombing:

This has been a most terrible and tragic atrocity that has cost many innocent lives. [...] they are trying to use the slaughter of innocent people to cower us

So it is fine to kill guilty people, in war or through death penalty? If someone emphasizes that the victims were innocent, you notice that this person has absolutely no problem with killing people. Else he would not make the difference between innocent and guilty ones.

Think about how many people the British Army has killed all over the world. That is not a problem for Blair because they killed guilty people.