Satanist-infested rocketry nuts at Devil's Gate - a.k.a the Jet Propulsion Laboratory, tell us there's no chance it'll harm us this time at least, so why not trust them/NASA as we've trusted them with Not Putting Their Research to Bad Use Like Weapons, safe disposal of rocket fuel and such, and using our tax dollars for maximum humanitarian needs with maximum economic efficiency. Don't we all want to be trusting souls? Especially with people who use sliderules and do math in their heads and can speak with such self-assurance as to declare absolutes about vast moving astronomical objects in future events?
Ever hear of Chaos Theory? If you don't believe it now... If you live longer, you will.
I'm not worried. Worry has no good use except in the very short term to prompt some practical strategies regarding the thing in question. If a big-ass asteroid hits our planet (or even moon), or throws things awry on them onnaconna gravitatonal pull or cosmic rays or sompin... Well, if we survive, we'll probably soon wish we hadn't. NOTHIN WE CAN DO ABOUT IT (forget those sci-fis wherein we're saved by rocketry; that's a cometload of BS hitting the oscellator of reality.) As the guy who managed to get his innocent 'best friend' sent to jail for his own crimes explained, 'What can I say, Judge Judy: SHIT HAPPENS!'