the use of incendiary weapons (like white phosphorus) against civilians or civilian areas is banned since around 1977.
it is just that some nations like the US and Israel didnt sign the treaty.
the greatest nation on earth
When I was in the military we learned that the Geneva convention authorized 50-cal ammo against equipment but not humans. Of course most of the enemy were wearing clothing and that could be classified as 'equipment'. As I understand things, 'willy-pete' is authorized for 'illumination' and 'smoke screens'. One cannot have to much light on the battlefield no matter what time of day it is, and having some smoke is awfully useful...especially when it burns people's flesh down to the bone.
IIRC, when we first went into Iraq for the second time we dropped a lot of napalm. But it was OK because we had re-named to something else.
War is a racket people. Anyone who implies that a war is 'just' or we are 'humane' or any of that shit is a liar or doesn't know their ass from a hole in the ground. We (the U.S.) should never engage in a conflict without being utterly prepared for our being guilty of committing all manners of atrocities. Nor should we support anyone else so engaged without expecting similar or worse behavior. That is not to say that we should never do it, but we also should be prepared for what it means.