The fact that you are more concerned that your President is killing US citizens without charge or trial outside of a warzone than that your President is killing human beings without charge or trial outside of a warzone is at the heart of what is wrong with your country.
Semantics? That is "the heart of what is wrong with your country"? "Wrong with your country" is what... pretentious motherfuckers who post online?
There are many problems in the world and many problems in our country. The only problem identified by your post is you.
American exceptionalism is the problem I am referring to. More traditionally known as 'hubris'. There are some good plays about it, you should check them out. The Greeks had the concept nailed down about 2500 years ago.
Your government and many of your citizens operate on the basis that there are "Americans" and "others". You regard yourselves as special, privileged, the chosen people. You have failed to register that this is obviously not true, nor have you registered that your supposedly permanent hegemony of only a few years ago is already gone.
Once you decide that some are "more equal than others", you lose the ability to impartially assess any situation. The concepts essential to a just, democratic world become unworkable, because they rely on the opposite view, that no-one person or group should be more privileged than any other.
The GP's comment exemplifies the (majority) American mindset - murdering people is only problematic if it offends your constitution. Well, guess what? Fuck your constitution. It's problematic because it's fundamentally wrong, not because it offends some American document which you guys tend to ignore most of the time anyway.
Hence you cannot understand (a) your immense economic problems (b) your immense geopolitical problems or (c) your immense problems with groups of angry foreign men wanting to hurt you. None of it makes sense to you because you cannot see that you are not special, and therefore that there will be no automatic Hollywood ending to these dramas.
Bill Clinton made a speech towards the end of his presidency where he argued strongly that the US should strengthen international institutions and human rights standards as much as possible. His reasoning was that America's time in the sun wouldn't last forever, and that when some other power - China, for instance - was dominant, America would be grateful for strong and liberal democratic international governance. Sadly Bush II and Obama haven't heeded that warning, and have contributed to a world of unilateral murder and mayhem as a result. The precedent of the powerful being entitled to murder the weak instead of pursuing them according to law will have terrible consequences for all of us, I fear.