Writing in the Guardian, Glenn Greenwald (@ggreenwald) explained why western nations can end up as targets and victims of violence:
"The answer is actually well-known and well-documented. As explained by the CIA, the Pentagon, former CIA agents, and British combat veterans, spending decades bombing, invading, occupying, droning, interfering in, imposing tyranny on, and creating lawless prisons in other countries generates intense anti-American and anti-western rage (for obvious reasons) and ensures that those western nations will be attacked as well. In the London case, the attacker cited precisely such anger at US/UK aggression as his motive ("this British soldier is an eye for an eye, a tooth for a tooth. . . . the only reason we killed this man is because Muslims are dying daily"). Those are just facts."
