An ethical person would suggest that the ultimate goal of any society should be for their interest and the greater good to gradually become the same thing, but since you’re ideologically opposed to doing that I will discuss this question on your own terms.
The first thing to keep in mind is that the United States has literally never warred for humanitarian reasons. The basic pattern for all American wars is as follows:
1.) Developing nation elects a ruler who is hostile to US interests and/or white oligarch ownership of the means of production, typically after decades or centuries of American colonialism demonstrates itself to be exactly as benign as it sounds (Note that Americans ideologically deny this is colonialism; it’s just the “free market”).
2.) US spends years or decades terrorizing the country by financing legal political oppositions and/or violent insurgencies, culturally isolating them through their monopoly control over cultural products, and financially isolating them through their monopoly control of the global interbank exchange and control of the world’s reserve currency. (Note further that unlike most countries, all electronic transfers in the US are intermediated by the US government. In practice this means you cannot import or export anything anywhere unless the US government approves.)
3. a.) Once the US sanctions cause a humanitarian crisis, the United States advocates for regime change to protect the poor innocent people from their failed socialist government
-OR-
3. b.) If the US sanctions fail to cause a humanitarian crisis, the United States advocates for regime change to protect the poor innocent people from the strongman dictator who held his country together by force
4.) The US invades, using very expensive weapons to preferentially target civilian infrastructure.
5.) The US installs a puppet provisional government and forces them to give no bid civilian reconstruction contracts to US firms, payable in natural resources.
6.) The US garrisons the invaded country until reconstruction is sufficiently complete.
The result of this process is a favourable regime in a part of the world otherwise hostile to the United States, and a direct transfer of wealth from both the American people as well as the invaded country to American oligarchs.
This pattern, to be clear, even applies to the “good” wars. Yes, even World War 2. Yes, even the Civil War. This is the true face of American realpolitics.
This leads to the first misconception: the United States does not invade other countries for “[collective] your interests”. They do it to benefit American oligarchs, whose interests have zero overlap with yours. Now, I’m not saying geopolitics isn’t a team sport. It is. But what I’m saying is, you aren’t even on the team. You’re paying to be there, by tax and labor. You’re not a player, you’re one of the dudes in the bleachers. You might cheer when “your” team scores a point, but at the end of the day, that trophy ain’t coming home with you son.
And then the second misconception: that the US leaves the country. You folks don’t. You pacify the country until it’s safe to do business and your corporations move in. Any country touched by the United States will never be suffered freedom from its oligarchs.
And then the third misconception: that Americans are “inactive” observers in the resulting chaos, rather than active participants in it (not even including the oligarchs profiteering from it).
So then the question was, should the US actively intervene to make the world a better place? The US could probably do enough good in the world by just not actively intervening to make it a worse one. Taking the question more seriously though, it depends on what you hope to accomplish. Current US foreign policy has found a way to extract foreign wealth that’s basically the same thing as Roman poll taxes, without the overhead of actually having any responsibility for the conquered. If your goal is to enrich oligarchs, you can’t go wrong with what you’re already doing. But if your goal is to do the morally right thing, then... maybe?
