"Yet, when something happens to re-affirm what we know to be true yet cower from recognizing, that we are just players of a greater history, it terrifies us. It's painful to confront the fact that there is no arbitrary line between "history" and "life"."
This is one of the most important crutches of eastern philosophy ;O This is why I focus on it so much, because it's very "Real" and metaphysical. Most people think they are all mystical and such which is kind of ironic to me

Like that episode of curb your enthusiasm with gil the pornstar and they tell him to take off his shoes and he says, "but they're clean" and they go, "That's not the point it's a tradition"! Actually the tradition is to take your shoes off before you enter a house so it doesn't get dirty. Common sense sort of stuff.
What you described is the essential ground working of the idea of "Karma". The entire history of the world(even existence) is kind of compounded and coelesced into this moment, this present, because the entire history of World lead to this moment, this present. If the big bang hadn't have happened, we wouldn't be here, if 9/11 hadn't happened, we wouldn't be having this conversation(there's obviously more effects than that, though), and similarly the actions my parents commited in their lifetime before I was even born also effect me.
It's kind of like "Chaos theory" I guess, if you remove variables from your lifetime would you be the same person? If you removed variables from history would you still be the same person? Chances are, no, you wouldn't.
I didn't really care when 9/11 happened either ;O I remember getting in a "Fight" with glowbelly over it, pretty much over the same reasons.
I didn't particularly care that a bunch of people died, lots of people die everyday. It actually kind of made me mad that people are so ignorant that they were actually angry and patriotic over this. As if we live in some utopia free of war, where nobody ever hurts one another.
It was almost as if they were saying, "A BUNCH OF AMERICANS DIED, AMERICANS, THE MOST IMPORTANT PEOPLE IN THE WORLD. WHAT? LOTS OF PEOPLE DIE EVERYDAY? MORE THAN DIED IN 9/11? WHO CARES THEY ARE DUMB NONAMERICANS AND YOU ARE GOING TO JAIL FOR NOT LOVING AMERICANS.
I also hate that our socio-political and even economic situation at the moment was dictated by a lie, and also that somehow that lie is insignificant compared to god forsaken purgery over a blowjob.
I'm a bit hungover, and now it's time for breakfast ;O