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.