And there are not that many indications that we are moving towards that direction or we can even ever have. I guess that sort of idealism might have existed in the late 40s immediately after the UN was established but it never had a chance.
External or internal (which seems rarely feasible unless the government is highly incompetent) regime change realistically is the only thing that worked.
That sort of idealism existed as late as 1962, but its leading proponent was cancelled in 1963: https://news.ycombinator.com/item?id=46482997