I strongly disagree with the idea that we have some moral obligation to either support the UN, or that we have an obligation to maintain peace around the world. Strictly speaking, I don't see that there is any reason to suspect that we do. I don't recall - and I speak somewhat tongue-in-cheek
- when the United States or some other country was handed the Commandments of International Moral Obligation, but I suspect that I wouldn't find them convincing anyway.
But, that said, I don't recall the United States signing anything that requires us to protect anyone not in NATO, and only then if we are attacked. Personally, I think we should also withdraw from NATO. If, for some insane reason, Putin decided that he wanted to own Europe all the way to the Atlantic (a proposition I highly doubt), the Europeans can pay to stop it themselves. And if we get into a scuffle with North Korea, why drag Europe into a war they neither need nor want? But this is a rabbit trail. Suffice it to say that we are not obligated by any treaties I know of to start killing Syrians. And, even if we were, countries withdraw from agreements all the time.
Most of the arguments for intervention in Syria seem to be moral in nature, to wit, that we are obligated to attack and kill people to prevent them from doing harm to others. Why we are so obligated has not been, I think, adequately explained. The argument that we are our brother's keeper, logically extended, results in the premise that one should annihilate one's own welfare to aid another. Countries which adopted such a policy, economically or militarily, could not long exist.
Nor, does it appear, that such intervention is practical. Given Orange's statements, and the fact that Russia appears to be using Syria as a means for possibly testing out their military hardware on ours, we would be foolhardy to think that we could fix everything with a few days of bombing. Moreover, even if we did, it isn't Assad who is the greatest long term threat to us. By aiding the rebels, we would almost certainly be sharpening a knife for the throats of our own civilians, on down the line.
Lastly, interventions have not historically been a good bet. Gulf War 1 ended with Saddam preparing to embark on a gassing of the Kurds. Our defense of the Kuwaitis and the Saudis had pretty much zero effect on our standing in the Middle East, unless you count the fact that our presence on the Arabian Peninsula helped inflame radicals. Our aid to the Afghans during the Soviet invasion pretty much resulted in the radicals there merely marking us down as the second target to hit. We aided in the Libyan revolution, only to have our embassy attacked and the brother party of the Muslim Brotherhood become the second most powerful political body in the country. Nor did our actions in Bosnia and Kosovo result in much for us besides pissing off the Kurds and Russians in a major way. Our best-outcome situation in Afghanistan will be an oppressive Islamic theocratic demi-democracy, and while the Iraqis couldn't wait to be rid of Saddam, they also spared almost no time before attacking us, and, to a
much greater degree, each other.
There
is something strange about the idea that one can get people to think our way if we just shoot a few of them. We certainly haven't changed the minds of North Koreans, we certainly didn't bring democracy to Vietnam, and the Somalia intervention only succeeded in wasting a vast amount of money and some American lives. Of the few times when intervention has succeeded, such as in World War 2, we have found it necessary to kill millions before we were finally able to change cultures and minds. And a good portion of Japan is still trying to argue that it was our fault.
The United States has no obligation to help others in the world. It lacks the ability to easily address the problem in any case, and, even if it did, the results would probably be bad for the United States, and quite possibly the people in Syria. The United States should effect no action towards Syria.