I've made this general point before, but one of James Fallows' correspondents states it more cogently and in more detail in remarks I will quote in their entirety from Fallows' site.
It is the policy of the United States that it may kill anyone it wants in certain areas of the Middle East; the executive branch decides and kills. The claimed entitlement to kill includes not just those targeted but also anyone who happens to be nearby. The United States seeks to minimize this “collateral damage,” but accepts however much of it is necessary to achieve its killing objectives.cordially,
As a result, everyone in the affected areas of the Middle East has for a long time lived in peril of a sudden deadly attack by the United States. Reports on how many we actually have killed vary, but the number appears certainly to be in the hundreds and likely to be in the thousands.
This policy comes with a cost: the people who are subject to it and their sympathizers will seek to retaliate by such means as are available, even as we would do if a foreign country’s drones were hovering over Connecticut and killing people in the same fashion. The idea that such retaliation can be willed or persuaded out of existence is a fantasy. Retaliation might be forestalled by resort to the level of force used against Germany and Japan in WWII, but our country is not prepared to do that or pay for it.
Given that the people subject to U.S. violence will retaliate “by such means as are available,” what are we in for? It appears that their capabilities are limited, for now, to relatively small-scale random killings by suicidal attackers such as those in San Bernardino. U.S. authorities can prevent some of these attacks, but not all. At least so long as the U.S. pursues the discretionary killing policy described above, every American must bear the risk of being killed or maimed in the occasional retaliatory San Bernardino.
This state of affairs represents a possible exception to your “Chickenhawk Nation” diagnosis. Americans have persuaded themselves that their country can wage war on foreigners at no personal cost to them, but only because they refuse to see the connection between such wars and the desire of those subject to them to retaliate. They are persuaded by propagandists such as Fox News that what is really retaliation occurs because attackers “hate us for our freedoms.” We in fact are the front-line soldiers in the drone war.