[chongli]

From your link:

400-500 kilotons of TNT

I don’t know about you but I’d consider a Hiroshima-scale explosion pretty deadly. We just got lucky it didn’t hit the middle of a major population centre at a more direct angle. That could have been catastrophic.

[WJW]

It would suck to be in the area, yes. But the comment I was responding to said "pretty deadly impact from Earth's point of view." Hiroshima-scale explosions don't make an appreciable dent in the Earth itself, and any human population outside immediate vicinity will still be fine.