> Send the US Army to Malawi bearing Super Soakers?
When you put it like that it, of course, sounds silly but try to see it the other way around: Take all the money spent on wars, where lots of infrastructure (usually among the first targets) and environment ends up being destroyed, and imagine it's instead spent on infrastructure projects helping the actual civilian population.
Yes it's naive, yes it's very unlikely to ever happen, but I still like to think that the US Military acting as a demilitarized "global infrastructure building force" would have done far more good for humanity than constantly waging wars on barely defined things like "terrorism", leaving destroyed wastelands and lot's of disgruntled people in their wake.