You gonna let a few space rocks stop us?
The Moon is no less safe from space rocks, as are space stations, etc.
We either expand into space or we die. The big space rock that has our
number on it - be it Apophis or another one - isn't going to be stopped
by Earth's few miles of air, and if we are all stuck on the same planet
when that happens, then there is virtually no hope for humanity.
This comment of humanity belongs on Earth smacks of the "We need to
spend our money on Earth first" limited thinking that I despise so much.
Then again, perhaps our next step in evolution is better suited to roam
and colonize the galaxy.