Doubt there would be much reaction if we found napalm. Them using it against us is a moot point since the only effective way of using it is from the air. US troops haven't been under an air attack since Korea.
And no napalm is not a WMD. For that matter it isn't even classified as a chemical weapon.
Quote:
These Military Chemicals are Not Considered to be Chemical Weapons
Incendiary agents such as napalm and phosphorus are not considered to be CW agents since they achieve their effect mainly through thermal energy. Certain types of smoke screen may be poisonous in extremely high concentrations but, nonetheless, smoke ammunition is not classed as a chemical weapon since the poisonous effect is not the reason for their use. Plants, microorganisms, algae, etc. which produce toxins are not classed as chemical weapons even if the produced toxins belong to that class. Pathogenic microorganisms, mainly viruses and bacteria, are classed as biological weapons.
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http://www.opcw.org/ is the source. For the specfic text run a search for napalm on the site.