Since there is a lot of talk about the US revenge killings in Afghanistan after the fall of Kabul, its worth saying that according to
https://airwars.org/conflict-data the US has quietly ended its murder campaigns in West Asia and North Africa. That is a good example of an administration making the world better in the ways it can do by just refusing to give permission to do bad things (versus the things which require new laws or institutional reform which take longer). The drone strikes began under Bush II and continued under Obama and the previous president, so there was a lot of bureaucratic momentum behind them.
