If you lived in a house that had a rat "nuisance" you might tolerate it. But if one of your children died from a rat bite, you might be tempted to start going around killing all the rats in the house and getting rid of the rat holes.
After 9/11, there were a lot of rat holes in the world. You don't worry so much about which rat bit your kid as getting rid of all the rats. The most obvious infestations were Taliban Afghanistan and Saddam's Iraq.
So goes the thinking in this article. Check it out.