#4
This country has engaged in a lot of killing over the years. Although many reflexively push unpleasantries aside, some folks remain keenly aware of the more dramatic episodes - those characterized by lots of noise and blood, and for which the stated reasons often turned out to be utterly bogus. Far fewer Americans know of more discrete behaviors - e.g., chopper pilots ferrying hitmen with death lists off into the backcountry of backwater countries - carried out in their name.

And when it comes to the Why Question? I'm not sure, but almost certainly nothing even remotely positive.