As a member state of the UN, we are obligated to perform "Peacekeeping actions."
This distinction enables the US to engage in "joint activities" with the cooperation of other member nations-- which is basically what the US has been doing with its meddling in the middle east (
at the request of the Saudi government, and pals) and with its enforcement of UN sanctions and nuclear non-proliferation mandates.
the US has also been using those obligated operations for its own gain, at the same time.
(recent example-- the bullshit Trump has been doing with the Iranian nuclear deal, which is blowing up spectacularly, and will likely result in some very real spectacular, actual explosions, in the near future.)
This kind of blatantly obvious malfeasance has been going on for so long, that I don't think our politicians know any other way to act in the world stage.
The world really is better off without every tinpot in the world having nukes.
The world really is better off without yearly wars going on in underdeveloped nations, fighting holy wars over ideology.
But the would really WOULD be better off, without the US (and other large powers) abusing those actions for direct, tangible quid pro quo, and using them as a cover to install puppet dictators, and usurp actual democratic processes in other nations that have resources the US is interested in.
This is basically fear mongering on my part now-- But the number of "mutual aggression" pacts the world has put together strongly resembles the hotbed of cray-cray that was the powderkeg that initiated the first world war. Just without kings and kingdoms, and replaced with more elected governments and international unions. All it would take is for Russia to sign a mutual aggression pact with Iran, and then for the US to continue having to intervene there on the behest of Saudi Arabia, over claimed drone strikes and nuclear threats, and boom, shit would get fucking real.