How much have the United States evolved in terms of politics over the last couple decades? A couple of quotes might clarify.
Make no mistake; the United States will hunt down and punish those responsible for these cowardly acts.
We will not forgive. We will not forget. We will hunt you down and make you pay.
Here's hoping the second payback doesn't add too much to the couple trillion € and the couple hundreds of thousands of casualties from the first Afghan payback.