How can you bomb something back to the stone age, when it is already there, especially the northern areas.

>It had always perplexed me that Pakistan wasn't on the Axis of Evil list. Now we know why.
>
>US 'threatened to bomb' Pakistan
>"The US threatened to bomb Pakistan 'back to the stone age' unless it joined the fight against al-Qaeda, President Pervez Musharraf has said."
>http://news.bbc.co.uk/2/hi/south_asia/5369198.stm