".....The US, the UK and its allies have repeatedly killed Muslim civilians over the past decade (and before that), but defenders of those governments insist that this cannot be "terrorism" because it is combatants, not civilians, who are the targets. Can it really be the case that when western nations continuously kill Muslim civilians, that's not "terrorism", but when Muslims kill western soldiers, that is terrorism? Amazingly, the US has even imprisoned people at Guantanamo and elsewhere on accusations of "terrorism" who are accused of nothing more than engaging in violence against US soldiers who invaded their country.
It's true that the soldier who was killed yesterday was out of uniform and not engaged in combat at the time he was attacked. But the same is true for the vast bulk of killings carried out by the US and its allies over the last decade, where people are killed in their homes, in their cars, at work, while asleep (in fact, the US has re-defined "militant" to mean "any military-aged male in a strike zone"). Indeed, at a recent Senate Armed Services Committee hearing on drone killings, Gen. James Cartwright and Sen. Lindsey Graham both agreed that the US has the right to kill its enemies even while they are "asleep", that you don't "have to wake them up before you shoot them" and "make it a fair fight". Once you declare that the "entire globe is a battlefield" (which includes London) and that any "combatant" (defined as broadly as possible) is fair game to be killed - as the US has done - then how can the killing of a solider of a nation engaged in that war, horrific though it is, possibly be "terrorism"? ..."
From The Guardian - 'Was This Terrorism?'