What an incredible coincience!
The earth has existed for billions of years, and - wouldn't you know it - as soon as we start looking out there for things that might hit us, it turns out we find one!
/sarc
As opposed to the BILLIONS of rocks that have hit the Earth during the past 4.5 billion years of its existence?
Why are you surprised that we find something when we start looking for it when we have ample evidence on Earth and the Moon that we have been hit by things throughout our entire history? There's very good evidence of several significant impact events in the last 400 years, and tons of direct evidence of impacts resulting in air burst explosions up to the multi-kiloton range in the last 30 years (those were recorded by our early warning satellites and, originally, we thought they were nuke tests).
I would have been VERY surprised if we didn't find anything. In fact, the fact that we hadn't found anything significant made me question the methodology and even the competence of the folks running the search.
This is real. It's not the only one. Get over it and deal. Is it happening tomorrow? Not likely. Is it going to happen? 100% guarantee.
If you truly were a pessimist you would take exactly the opposite position on this issue. I think you should change your forum name to "cockeyed optimist."