Was the London killing of a British soldier 'terrorism'?

www.guardian.co.uk

Glenn Greenwald: What definition of the term includes this horrific act of violence but excludes the acts of the US, the UK and its allies?

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"Put another way, the term at this point seems to have no function other than propagandistically and legally legitimizing the violence of western states against Muslims while delegitimizing any and all violence done in return to those states.... Michael Moore sardonically summarized western reaction to the London killing this way: 'I am outraged that we can't kill people in other counties without them trying to kill US"

Bruce .S.Tinco