Thanks to the powers of physics, math and astronomical measurement, the known chunks of space rock can be tracked pretty accurately.
Today's meteorite was, as far as I can find, not yet under observation. And since it was traveling at least 7 miles per SECOND when it hit our atmosphere, there was really no time to prepare or evacuate, other than general emergency preparedness. We puny humans don't have any weapons system that would be able to intercept a large rock moving at such speed. Even if we did, the added explosive force within our atmosphere might only add to the shock wave, which, in this case, caused most of the damage.
This is a lot like a lightning strike in terms of rapidity or advance warning. And much less likely, statistically, to actually hit Earth. Really not worth losing sleep over.
If some major catastrophe were to hit in our lifetimes, or even for the less-impressive ones that do occur with some regularity, I don't expect to defend my home or food against other people who need help. As a society, we're far more likely to need each other to survive and rebuild. As a human with a soul connected to all other souls, I'm more in sync with Kindred Spirit's story of the zen master than with survivalism.
If my life is attuned to a higher purpose or God's will (however we choose to think about it), I have nothing to fear, not even death.