Its not. Thats how they reset the world. With nukes. All crators are all nuke sites. Where is all this space rock they talk about.
Discussion
Cosmic time scales don't really apply to us, like at all. Floaty rocks out there aren't always and forever putting a target on Earth's back, but it does happen occasionally.
If ome major event like this happens roughly every ~100,000 years we aren't lucky enough to not see it happen in our lifetime. Kind of a bummer.