Not supporting war crimes or anything, but a more "heavy-handed or not-at-all" american involvement in foreign conflicts would be much better.
Like:
1. if you decide to invade Iraq, do a f proper large scale invasion, sweep the whole country, purge anyone opposing, pay some some of the reconstruction bill by training and equipping local forces, and after like 5 years or so of this occupation and purging, after you cleaned up the mess (or at least after you've reunited the country against one common enemy - YOU, which is still better than leaving a civil war behind), then f leave with parade and give them a "national freedom day" to celebrate or whatever.
or
2. if you want a foreign president down, either do it diplomatically, or give up, or do a proper job of f assassinating him and his entire family, don't start a bloody civil war that destroys an entire country and turns its population into refugees.
...the so called "partial involvement", where you go in, kick the bad guys' ass, and then leave without cleaning the mess or paying for it to be cleaned is the problem.