You'll get downvoted for this because the US believes it is in the right.
The US sees itself as a "policeman" not a "gangster", they are out to save the world, not conquer it.
And yet, the line between the two is very blurry. Kuwait was justified, Iraq contrived. Afghanistan meaningless. Iran is a solution looking for a problem (nooo they can't have nuclear weapons, but who trashed JPOA?)
The 20th century was no better. The righteous of WW2 allows any excess, Vietnam being a poster child.
For the US to change they first need to accept they are the bad guy. And that's a very difficult thing to accept. The shiny uniform for example is what the good guy wears.
But in the end the gangster and police can be hard to tell apart.
My current view:
The job of the hegemon is to maintain the status quo, proper order. Hegemony, the maritime order, global currency (US dollar), and forever war are inseparable. The cliché "if you want peace, prepare for war." Some low-level, mostly contained, amount of violence is the price for a larger "peace".
Post WWII, the USA did not engage in total war or seek unconditional surrender. Because breaking the equilibrium wrecks hegemony. As demonstrated by GWB's ill-advised conquest of Iraq, which (IMHO) was the deflection point for Pax Americana.
The notion of just war and world cop is mythmaking, rationalization. So the citizens will keep subsidizing the hegemony. (h/t Niall Ferguson) Any notions of justice, human rights, and whatnot were savvy marketing, born of (PR) competition with other hegemons.
As bad as Pax American hegemony has been for all participants, I'm certain we'll look back with nostalgia. In that "What has Rome ever done for us?!" sort of way. The ~70 years of (relative) peace was kind of incredible.
The emerging multi-polar world (and poly-crisis) is more chaotic, violent, and terrible. And will prove ever more so over time.
The US used to see itself as a policeman. It is now kinda going gangster.
You can't police a multipolar world - you can when you're the sole superpower in a unipolar word where "policing" can be a euphemism.
I think there is now a general or at least generational attitude shift about world policeman type stuff vs smash, grab and bully in America.