Even during the years of the Cold War, the intense confrontation between the Soviet Union and the United States, we always avoided any direct clash between our civilians and, most certainly, between our military.
Asymmetrical warfare is a euphemism for terrorism, just like collateral damage is a euphemism for killing innocent civilians.
What's brilliant about the United States system of government is separation of power. Not only the executive, legislative, judicial branches, but also the independence of the military from civilians, an independent media and press, an independent central bank.
The military is a discrete entity. Then they come back, and they're such a small percentage of the population, and they can't really - it's hard for them to talk to civilians.