I think we agree, though I don't think there's an "enough" that doesn't involve serious war crimes.
How so? I don't see why -- at least in theory -- a sufficiently-disciplined army couldn't occupy a country while restraining itself from abusing its inhabitants. At least nothing in the
list appears to prohibit an occupation itself. The current US military isn't anywhere near well-trained enough, as proven by Abu Ghraib and I'm sure a thousand other incidents that are less infamous, but that doesn't mean it couldn't be. The massive shift from current military culture and training to something more resembling, for example, that of the UK's police force would be challenging, but technically not impossible.
The key would be to (1) destroy organized opposition (the part the current US military is good at), (2) commit enough troops to secure
all parts of the country at once and destroy any insurgency (which in the case of a Middle Eastern country where the general attitude towards the US is negative could mean flooding the place with as many US soldiers as there are people in the country being occupied in the worst-case scenario, i.e., a truly massive number of troops), and (3) spend an equally-massive amount of money on rebuilding the infrastructure and industry to a
better state than it was before, while respecting the native cultural beliefs and governmental preferences to the maximum extent possible, so that no rational person in the country would be able to find an excuse to support ISIS -- "kill them with kindness," so to speak.
So: tens of millions of Americans (so many that we'd probably have to fire up the draft) and an order of magnitude (or two) more money then we're spending now, and I think we could actually stabilize and maybe even nominally-democratize Iraq
or Afghanistan
or Libya over a period of several decades. No chance we could afford to do all three at once, of course! We'd also need greater political will than the support for the WWII war effort or the moon landing (or maybe both combined), sustained over a longer duration....