To appease Karzai, who now sought to appease the savage Taliban, with whom the United States was now negotiating, the U.S. military tightened the rules of engagement, making it much more difficult for U.S. forces to fire in a war zone. On the flipside, the tightened rules of engagement made it much easier for the Taliban to kill Americans. The effect: the United States elevated the importance of enemy lives over American lives.