google apologizes

[Dravyk]

I just want ONE simple question answered.

Google searches sites.
They take the spider info, but it in a db, have it "cook" for 4-12 weeks, spew it out in the results.
A blackout, a hurricane, something happens that makes 20% of the web gone, and 50% of the rest of the US sites can't be accessed. (I'm making up these figures, just go with it.)
They then put it on the back burner to "cook".

So my questions is ...
Now, since this shit isn't real time
Since they know the results it has gathered over oh, let's say 3 days, is screwed
Since they know if they put those bot gatherings into the mix everything will be f**ked.
And they have 4-6-10 however many weeks before it gets there.

... WTF don't they ever just say, "hmm, this batched is tainted, we won't add the past three days into the mix a month from now, we'll just go with the next three days, it's not worth it"?

Why don't they just do that instead of screwing up everything all the time? It doesn't really take a genius nor even advanced programming or anything to say, hmm, bad brew, we won't use that one?