Whether it was fear or anger, in a situation where nuclear weapons could not be easily deployed, the Americans had no good methods to counter the "threat" posed by Chen Yu.
After all, counting Chen Yu himself, the deterrent force exerted by seven Demigods was simply overwhelming.
If the Americans were willing to pay any price—sacrificing half of their six Demigods and deploying nuclear weapons—they could indeed eliminate the seven Demigods. However, the cost of such an action was something the United States could not afford to bear.
More critically, the Americans knew that apart from Chen Yu, the other six Demigods were summoned by him. In other words, as long as Chen Yu remained alive, he could summon six more, or even more than that, at any time.
